Ryoko Otonashi

Ryoko Otonashi (音無 涼子 Otonashi Ryōko) is the protagonist of the Danganronpa/Zero novel series.

She is a fake identity of Junko Enoshima, an amnesiac version of Junko. While she has a rather eccentric way of thinking, she has no hunger for despair. She is in love with Yasuke Matsuda, her doctor, and the only person she can remember more clearly.

Despite being amnesiac, she still has the talent of the Ultimate Analyst (超高校級の「分析力」chō kōkō kyū no “bunsekiryoku”; lit. Super High School Level Analytical Prowess).

Ryoko stopped existing by the end of Danganronpa/Zero, as she regained her memories and returned back to her original persona.

Ryoko appears in the 30-minutes long OVA, Super Danganronpa 2.5: Nagito Komaeda and the Destroyer of the World as a part of Nagito Komaeda's imagination world.

Appearance
Ryoko is around 17 year old teenage girl. undefined

She has long, disheveled, dark red hair and eyes and wears the school uniform of Hope's Peak Academy. Her uniform consists of an unbuttoned dark grey cardigan on top of a white blouse with a red ribbon. The cardigan has the logo of Hope's Peak Academy emblazoned on it. She wears a short dark grey skirt and white knee socks.

Personality
Ryoko is presented as a girl with a psychological disorder which causes her to lose her short and long term memories. Because of this, she writes everything down in a notebook, the 'Ryoko Otonashi Memory Notebook'. While she has lost her ability to form new memories, she still has her ability to remember or learn 'procedural memory' tasks such as writing and reading.

Ryoko is generally carefree, with "natural cheerfulness". She has a rather eccentric way of thinking, which is not caused by her disorder, and she has a strange laugh. Because of her forgetfulness, she has trouble concentrating and may come across a bit dumb in other people's eyes. She may often appear uninterested and lacks a proper response.

Due to her quick memory loss, she feels that she is "uninvolved with the world" - at times she barely cares about anything that doesn't concern her or Yasuke, believing that things have nothing to do with her because she can't remember them. She uses this as a defense mechanism when in stressful situations. Yasuke is the only person she remembers more clearly, though it's only about her feelings towards him instead of any events, and because of this she thinks about him almost constantly. While he is rude towards her, she is grateful because he doesn't treat her with fake sympathy. She isn't worried about her condition either, because she doesn't have anything to compare to due to her memory loss and she sees her forgetfulness as a part of who she is instead of a disadvantage. A sudden cure would be a bigger worry for her, because it would mean separation from Yasuke.

Ryoko can't actually remember her Ultimate talent, but in times of peril she shows near supernatural analytical skills. At the times, she also appears to revert back to her Junko Enoshima persona, though only for short amount of time. Sometimes, Ryoko can hear Junko's voice and remember things about her, but she doesn't understand the connection between the two of them.

Despite being an amnesiac version of Junko, Ryoko has no hunger for despair and she is disturbed by killing and violence.

Ultimate Analyst
Ryoko has an incredibly precise analysis ability, which essentially allows her to predict what a person is going to do before they do it, and overall makes her great at planning. This is the talent of her original persona, but she cannot use it most of the time due to her condition. She doesn't remember her talent, but it seems she can use it if she is reminded of it or if she is having one of her clearer moments.

The talent isn't instantaneous, as she needs to observe something for a while in order to analyze possible outcomes, but it is still extremely detailed and fast thinking for a human. This is demonstrated in her encounter with Isshiki Madarai; after analyzing his fight with "Junko Enoshima," Ryoko is able to not only evade him, but make additional notes in her Memory Notebook as she is running away. She also quickly plans a detailed trap for him.

History
Ryoko is an amnesiac fake identity of Junko Enoshima. She was created after The Tragedy of Hope's Peak Academy, when Yasuke was asked to interrogate Junko about the incident. However, instead, he reluctantly assisted Junko by testing procedures for memory-erasing in preparation for the Killing School Life of 78th Class.

Having succeeded in erasing her own memories with Yasuke's memory-erasing technology, Junko assumed the fake identity of Ryoko Otonashi and hid from suspicion. As she no longer remembered who she was, she had to constantly use a notebook, where she wrote information about her surroundings, other people and events that had happened. In good intention, to protect her from herself and to protect other people from her, Yasuke attempted to foil Junko's plans by preventing her from regaining her memories. He gave her "treatment" regularly, though in reality he was making sure that her condition stayed the same.

Despite being amnesiac, Ryoko is still in love with Yasuke. He is the only person she can remember more clearly, though it's only about her feelings for him. Once, after Yasuke's mother died from an illness that caused memory issues, Junko swore she won't forget him even if she forgets everything else.

Chapter 3
Ryoko is a student in Hope's Peak Academy. Due to her illness, she often visits Yasuke for check ups. Her grades are so terrible that she should have been kicked out of school, however Yasuke talked to the higher ups and convinced them to let her stay under the claim that he would like to study her unique neurological disorder.

A month after the Tragedy of Hope's Peak Academy, Ryoko once again goes to see Yasuke for her treatment. Yasuke throws a scalpel towards Ryoko and repeatedly insults her by calling her ugly. He then asks her who she is, claiming that he doesn’t know because he keeps looking at his manga. Ryoko answers the questions and Yasuke is surprised to find out that she remembers what just happened and what they talked, meaning that her condition might be better or maybe worse.

Yasuke gives Ryoko her treatment. Ryoko is shocked when she is reminded that she was almost suspended from school due to her bad grades, especially because it would mean she would be apart from Yasuke. Yasuke tells her he defended her, because she is too valuable research subject to lose. They talk more about Ryoko’s condition. Ryoko claims she isn’t worried about it, and that she’s more worried about being cured, because she wouldn’t get to see Yasuke anymore. Darkly, Yasuke tells her she won’t let her treatment end.

As they hear noise outside, Yasuke explains to Ryoko about the reserve course students. He leaves to see the Steering Committee, while Ryoko sleeps in the lab.

Chapter 5
After Yasuke returns to the lab, he wakes Ryoko up roughly. He throws her out and tells her to come back in three days.

Disappointed, Ryoko returns to her room with the help of her notebook. She decides to kill some time and tries to redraw her sketches of Yasuke. She soon grows tired and continues to miss him, until she suddenly gets a threatening letter. The writer calls her Ms. Ultimate Pitiful Forgetful Girl and claims to have stolen all the past memories she’s written and hidden under her bed, and tells her to come alone to the fountain in the central plaza at night 1AM. Though angered about the supposed prank, Ryoko decides to go.

At night, Ryoko goes to the central plaza. She finds one of the Steering Committee's members dead and hanging from a tree with a rope around his neck. She finds a notebook in a small puddle of blood under the man.

Chapter 6
Shocked and crying, Ryoko runs away and tries to go see Yasuke.

She bangs the door, but doesn't get an answer. Instead, Yuto Kamishiro opens his door, which is next to Yasuke's. Ryoko doesn't notice him at first and confuses his age. Yuto introduces himself and asks her what's wrong while admiring her looks. Ryoko introduces herself and tells him she needs to see Yasuke, but Yuto answers that he isn't home. Yuto offers his help, but Ryoko has trouble remembering what happened. She reads her notebook and is shocked after resurrecting the memory concerning the body. She remembers the notebook inside the pool and worries she'll be blamed because of it. Quickly, she runs back to the scene, but the body has disappeared. Instead, she only finds the notebook.

Suddenly, Ryoko meets Mukuro Ikusaba disguised as Junko. She mostly talks nonsense, even confusing Ryoko, and threatens to rip off Ryoko's tongue. "Junko" then stops, just laughs and introduces herself. She claims to be the one who kidnapped and took Ryoko's memories hostage and takes the bloody notebook. "Junko" then explains that the body she killed has disappeared and that she wants to get Ryoko involved. Confused, Ryoko decided to run, but "Junko" gets on her way extremely fast (due to Mukuro's Ultimate Soldier skill). "Junko" tells her the identity of the body and mentions the Tragedy of Hope's Peak Academy.

Suddenly, "Junko" notices Isshiki Madarai hiding and looking at them. He shows himself and soon threatens the girls, as Junko Enoshima is his target and he assumes that Ryoko is involved with her. "Junko" duels with Isshiki, standing her ground (once again, due to Mukuro's Ultimate Soldier talent) and orders Ryoko to write everything into her notebook. After the fight, "Junko" tells Ryoko that it's impossible for someone like her to be taken down by someone on his level, and tells her to never take her eyes off the prey. Ryoko is confused, but suddenly "Junko" disappears and leaves her alone with Isshiki.

Ryoko looks at her notebook for help, and seeing the school's Tragedy mentioned, she tells Isshiki she doesn't know anything about it. This, however, makes her much more suspicious in Isshiki's eyes. Believing that she'll die soon, Ryoko begins to think about Yasuke and how she wants to meet him, soon forgetting her fear. Noticing the change in her, Isshiki puts some distance between them. At the moment and with new composure, Ryoko is capable of using her Ultimate Analyst talent, which is written on the first page of her notebook. She believes that "power of love" granted her the talent and she tells Isshiki she is going to see Yasuke. Isshiki is confused about who she talks about, but agrees that love is a great power capable of creating both unimaginable actions and madness, though he believes Ryoko might just be feeling desperation.

Using her talent, Ryoko manages to run away from Isshiki. He chases after her, thinking that she truly is a strange woman.

Chapters 7-8
Ryoko manages to avoid Isshiki's attacks by running and analyzing his behavior patterns written in her notebook. She avoids him once again and he falls on the ground, but soon gets back up. Amazed, he assumes she has precognition.

Chapters 9-11
Isshiki comes to the conclusion that there's some sort of secret in Ryoko's notebook.

He chases Ryoko down into a dark shed, where Ryoko gets the upper hand and tricks him. He is flattened by fallen shelves and loses consciousness, but tells Ryoko he still has "ace up his sleeve". Indeed, the second brother Nisshiki appears, attempting to knock Ryoko unconscious and break her arms and legs, but his own right arm gets broken by the real Junko Enoshima, who suddenly takes over Ryoko's consciousness. Ryoko has a hallucination where she regains memories of Junko, as she describes Junko's face as familiar, and also hears Junko describe herself as the Ultimate Despair and laugh her signature Monokuma laugh. Junko tells her she will come to remember her soon enough. Junko then kills Madarai by breaking his neck. As Ryoko loses consciousness, she hears Junko saying that when they meet again, she'll kill her properly.

Chapter 12
On the dawn, Yasuke learns that Ryoko has went missing. He looks all over for her, only to find her sleeping on his lab's bed. He ties her to the bed, to make sure she won't wander off again and she can reflect on what she did. When Ryoko refers to herself as his lover, Yasuke tells her he wouldn't have such a vermin as a girlfriend.

Angry, Yasuke lies under the bed, but he then turns silent. He sighs and says that Ryoko has always been that way and she knows the perfect ways to irritate him, referring to Junko. He tells her how in their childhood she destroyed her own sand-castle, and after hearing the frustrating story, Ryoko agrees she should be tied up. She is angry that she can't write the story on her notebook, though, but finds out it's next to her pillow. As she struggles to open it, she reads the sentence "It seems Junko Enoshima killed him —" and mention of a dead body at the central plaza. Ryoko panics about the dead body, but Yasuke doesn't seem to care about it and instead asks her if she knows who Junko Enoshima is, which confuses her. Ryoko tries to ask him if Junko is his friend, but Yasuke avoids the question and tells her that there is no body.

Ryoko can no longer reach the notebook and Yasuke tells her that Junko has nothing to do with them and she should forget about it, and that all of it was probably just stories she made up. Ryoko says she would never do that, because it would confuse her true memories, but Yasuke claims she must be very lonely due to her memory loss and she creates delusional stories for that reason. Frustrated about how badly she is misunderstood, Ryoko screams loudly that she is never lonely as long as she has Yasuke. She asks how he can forget that if she can remember it despite her forgetfulness. Yasuke wants to end the conversation and assures her that the notebook lies and she can believe in him instead.

Ryoko is conflicted, as the notebook and Yasuke are two the most important things to her. She decides to believe in Yasuke instead of in herself, and tells him that she will give away her memories if he always stays by her side. Yasuke stays quiet for a while and answers it's impossible right now, because he has other things to do. Ryoko says that his research is most important to him and he will never choose her. Yasuke says it's not it, but turns silent again. Ryoko begins to cry and asks him to at least cure her or make her forget him along with everything else, so she wouldn't feel so painful. Yasuke stands up quietly and wipes her face gently with a tissue while looking at her with lonely eyes. For some reason, Ryoko feels fear.

Silently, Yasuke turns to leave and tells her he has an appointment with another student, and that they can continue talking after he returns. Soon, she is untied by Yuto, who suddenly appeared. She is startled, but then reads the notebook to remind herself who he is. Yuto explains he's been in the room all along, but he wasn't noticed due to his talent.

Yuto tells Ryoko he can help her with the incident she has gotten involved in, as he can easily gather information. After some hesitation, Ryoko explains everything to him and he is surprised to hear Junko Enoshima's name. Yuto explains he's currently investigating a different incident, the Tragedy of Hope's Peak Academy, and he heard the name while while investigating. He says he doesn't know exact details, but he has heard rumors. Yuto then says that, as a remuneration for his help, he wants to have sex with Ryoko. Ryoko is a bit shocked and confused, as she previously considered Yuto as pure and innocent as his appearance. Assuming that they're in agreement, Yuto leaves quickly before Ryoko can say anything. In her usual way, Ryoko decides it has nothing to do with her and it's best just to ignore it.

Ryoko sits back on the bed, but soon Yasuke returns. Ryoko hugs him happily as she doesn't remember their previous conversation anymore. Nevertheless, Yasuke bashfully tells her that he's sorry and unusually lets her hug him. Then, he asks how she's untied, but she can't remember anymore. As she continues to cling on Yasuke, he whispers that the reserve course students' Parade is growing louder outside. Reluctantly, Ryoko leaves back to her room and dreams of Yasuke, believing that nothing else has anything to do with her anymore.

Chapter 16
Ryoko wakes up from her strange dream when someone knocks loudly on her door. Once again, it's "Junko". Ryoko panics after reading the notebook and reminding herself of her identity, and tells her to go away. Ryoko tries to explain she has nothing to do with her, but "Junko" claims that would mean letting her beloved Yasuke die.

Suddenly, "Junko" hugs Ryoko and says Ryoko should hate her more, to make the story's ending even more despair-inducing and perfect. Ryoko doesn't understand, but "Junko" tells her to let her true self reveal itself and give birth to the "new you". Ryoko fights free and once again tries to explain she has nothing to do with anything, but "Junko" claims she has everything to do with it, and simply doesn't remember. Her actions and their consequences still exist, even if her memories do not. "Junko" explains that even a single person's actions can throw the world into a chaos, and strangely Ryoko agrees somewhere deep inside her heart.

"Junko" tells Ryoko that she is involved with the Tragedy of Hope's Peak Academy, though she refuses to reveal the details, because it would make things boring. She says she'll give Ryoko a hint and then leave. She explains the two goals of Junko Enoshima and Ryoko writes them down - thoroughly crush down the school's symbol of hope, Izuru Kamukura, and kill Yasuke. Then, "Junko" turns completely silent and leaves, leaving Ryoko alone and in shock. Controlled by sudden emotions, she decides to run to see Yasuke, yelling and swearing to protect him and their world.

Chapter 3
Ryoko soon forgets where she is going and she is distracted by her drawing of Yasuke when she tries to look from the notebook. She flips the pages and soon remembers that Junko threatened to kill her beloved Yasuke. Full speed, she continues to run towards his lab. She opens the door screaming and startles Makoto Naegi in the middle of the room. She realizes he's not Yasuke and asks where he is. Makoto answers he's probably out and Ryoko begins to rant in frustration. Makoto tries to comfort and calm her down, but Ryoko is surprised by his kindness and finds him suspicious. Both of them are confused and he seems to find Ryoko a bit familiar. He introduces himself and explains that he came to give Yasuke the student handbook he dropped. Though still a bit suspicious, Ryoko decides to believe him for now. Hesitantly, Makoto tells her that there's a rumor about a student who has become forgetful. Ryoko continues to ask persistently if he used to know her, until he finally admits he did. Ryoko thinks about everything, and begins to feel that Junko has only lied to her. She begins to remember something.

Suddenly, the third Madarai brother Misshiki appears and grabs Makoto's shoulders. He claims to be immortal and a survivor of the student council, looking for revenge for the student council as well as his own pride, willing to do anything. Ryoko tries to tell him she's just a bystander, but he doesn't believe her. She tells him to look at her notebook, which is her proof, but Midarai shouts furiously that it doesn't prove anything. He assumes she might be the culprit's apprentice.

Madarai then turns expressionless, as he remembers Makoto. He asks his name and seems to threaten him, and the other boy is very terrified. Madarai tells Ryoko that Makoto's head will be crushed in an "unfortunate accident" if she doesn't obey him. Madarai looks at her with intimidating eyes while Makoto pleads to her silently. Ryoko then calms down as she begins to mumble her usual mantra, that it has nothing to do with her. Both boys are confused by her words, and she simply answers that Makoto is unlucky, like he himself mentioned before. To prove his point, Madarai is about to kill Makoto, but suddenly Mukuro appears and saves him by defeating Madarai. Very relieved, Makoto thanks the girl, and she answers that she was simply helping her classmate and happened to pass by. Makoto think he's lucky because Mukuro happened to pass by. After an awkward silence between the three, Ryoko once again begins to think about Yasuke.

Soon, Mukuro notices someone's hiding close by, and it turns out to be Yuto. Ryoko has forgotten him, and he reintroduces himself and asks her to remember him this time. Makoto says they should do something about Madarai on the floor, and Mukuro says she'll do it. Yuto agrees they shouldn't tell the security department about it, as he and Ryoko are busy with their case. In a hurry, he takes Ryoko's hand and asks her to go with him. As the two leave, Ryoko feels uneasy as she can feel a certain aura and incredible strength in Makoto after looking into his eyes. Though she doesn't realize it, it's his Ultimate level of hope. In a matter of minutes, however, she completely forgets his existence.

Chapter 5
Ryoko and Yuto go talk at the East District's cafeteria. Yuto asks if someone came to Ryoko's room during the morning, and she checks her notebook and answers that Junko Enoshima did. Yuto reveals that he put a wiretap inside Ryoko's room, claiming it was for crime prevention. He also says that he has done the same to the rooms of hundred other people, though they all seem to be girls.

Ryoko tells Yuto about Junko's goals, and she feels great anger and fear when she reminds herself about her second goal - killing Yasuke. Yuto tells her to calm down and says it must be a bluff, because there is no sense in telling other people about a murder you have yet to commit. He is more worried about the first goal, Izuru Kamukura, who is believed to be the culprit of The Tragedy of Hope's Peak Academy. Yuto says he overheard a conversation between faculty's female members, and he has now realized that Junko Enoshima must be the one who discovered the school's incident. She was interrogated by the school very throughout, meaning that Yasuke must have had a part in it, being the Ultimate Neurologist. Ryoko is shocked and doesn't know what to think. Yuto ends the rather one-sided conversation, reminds Ryoko about his "reward" and leaves, saying he has definitely solved the case the next time they meet.

Ryoko feels anxious and confused, but she's sure she'll forget about all of it soon. Suddenly, as she stands up, she feels lightheaded and her mind goes blank. Once again, she hallucinates the familiar figure and signature laugh of Junko Enoshima, who says she's surprised that Ryoko remembered her after the last time. Junko says that she unfortunately can't kill her this time as well, and that she will kill her after she has tasted more despair. Ryoko doesn't understand the connection between the two of them and she soon loses consciousness.

Chapter 7
Ryoko wakes up in a strange room and can't find the exit. She begins to panic, but she's then suddenly greeted by a female maid wearing a Monokuma mask. The maid says she has prepared her tea, but it's too cold and Ryoko finds it disgusting. The maid turns to leave and reveals a hidden, rotating door on the wall.

Ryoko leaves the room and arrives to another, larger room made of concrete. There, several people with Monokuma masks are sitting on school desks, looking at monitors. The maid explains they are a secret society of the reserve course students, and she claims they are "mutants", who silently created their society in the basement beneath an abandoned club room in the West District. The maid explains that their reason for it is the Parade, the reserve course students' revolution. The maid is increasingly angered and begins to shout about Hope's Peak Academy's views and how the school used them.

Ryoko doesn't understand how anything relates to her and decides to escape, asking for bathroom. She starts to run towards the end of the hall, but she is then too curious to see what all the sitting people are looking at. Turns out the monitors are completely black, as "phase one" had just ended. "Phase two" begins and the screens show lots of flashing words, and then disturbing video footage from the Tragedy of Hope's Peak Academy. One of the Monokuma Heads speaks to Ryoko, sounding uninterested and immersed in despair. When Ryoko asks how long they have watched the video, the boy answers 5818 times.

Disturbed, Ryoko tries to escape the place. She runs down passageways, but she only sees concrete walls. Eventually, she finds a dark room similar to two jail cells. Inside one cell is an old man, but he turns out to be dead, hunched over on a chair. Instead, an old man inside the other cell speaks to Ryoko in a defeated voice. Turns out both of the men, the last Steering Committee members, were tortured for information and had their eyes hideously sewn together. The man realizes Ryoko isn't part of the society, and asks her to help him in exchange of information. He explains that the reserve course wants to find out Izuru Kamukura's location and overthrow the school with his power. He says Ryoko needs to stop the reserve course and reveals that Izuru has been hidden inside the old school building. As Ryoko tries to continue listening, she suddenly feels dizziness. The man finishes speaking and asks her to free him now, but Ryoko is once again taken over by Junko. She laughs her signature laugh, angering and confusing the man. Ryoko loses consciousness and it's implied that the society's members came inside the room and killed the man.

Chapter 8
Ryoko wakes up in a bright, white room, feeling refreshed as if she has been reborn. Unlike before, she manages to recall memories - the reserve course, their secret basement and Monokuma. As she looks at her notebook, she realizes she is inside Yasuke's lab. She doesn't see him and this makes her remember that she hasn't had her treatment for a while. She hears a sound under her bed, which makes her remember the conversation she had with Yasuke and assume he is under the bed again.

However, the person under the bed turns out to be Kyoko Kirigiri, the Ultimate Detective. She gets up and mentions that the rumors seem to be true. Ryoko doesn't understand what she means and Kyoko clarifies that Ryoko must be the amnesiac who has been having treatments. Ryoko continues to feel itching sensation in her mind and she begins to feel that Kyoko is familiar. Kyoko introduces herself, but since her name isn't written in the notebook, Ryoko assumes they haven't met before. When Kyoko mentions Yasuke, Ryoko asks her where he is, but she doesn't know.

Kyoko says she is looking for Yasuke as well, as she needs some information. Since Ryoko assumed Kyoko was Yasuke at first, the detective asks if he has a habit of being under the bed. Ryoko answers honestly that Yasuke told her it helps him concentrate when he is frustrated, but Kyoko believes that is certainly a lie. She shows Ryoko that the bed is actually hiding a secret room, pitch-black clothing and shoes stained with blood inside. She tells Ryoko that she believes Yasuke is involved in the murder of the Steering Committee members. Ryoko tells her he would never kill anyone, but Kyoko answers she said he was involved, not that he has murdered. She then mentions the murder of Soshun Muramase, which was disguised as a suicide. Kyoko says that most likely Yasuke murdered Soshun. Hearing this makes Ryoko feel intense anxiety and she doesn't understand anything anymore.

Ryoko starts to scream that it has nothing to do with her. She tries to reassure herself that she'll eventually forget everything anyway and everything will go back to normal. Suddenly, Yosshiki Madarai breaks through the door.

Chapter 10
The fourth brother Yosshiki confronts Ryoko and Kyoko Kirigiri in Yasuke's lab. Ryoko is confused about how many times she's seen Madarai get beaten up, and Yosshiki claims once again that he, "Isshiki", is immortal. However, Kyoko calls out that Isshiki Madarai's "immortality" is apparently just a ruse, much to Yosshiki's surprise. The brothers then choose to reveal their secret when the fifth brother Sasshiki appears. Kyoko speaks of how the Madarai brothers really look just like one, and the sixth brother Rosshiki soon appears to outnumber and beat up Ryoko and Kyoko.

Ryoko is pushed out of the lab into the hallway, where the seventh and eighth brothers Shisshiki and Yasshiki appear. Ryoko flees the scene by jumping out the window into the building's garden, and she is pursued by four of the brothers, with Rosshiki remaining behind in a fight with Kyoko.

Mukuro appears again, telling the brothers not to go after Ryoko. The brothers refuse to give up, stating that they swore to avenge the student council. As Mukuro mumbles about not wanting any more victims, the brothers then ask whether she knows what happened to their three missing brothers. As the four brothers lunge at the girl in unison, Mukuro easily knocks all four of them out. Mukuro then tells Ryoko about Junko, explaining her status as the Ultimate Despair. Afterwards, Mukuro tries to persuade Ryoko to kill the Madarai brothers by telling her they will probably kill Yasuke once they learn of the death of Soshun. She also tells Ryoko that she will give her Yasuke's whereabouts as exchange. Ryoko is shocked and says she can't do it after imagining the killing in her mind, but Mukuro then tells her that she will tell her anyway and explains that Yasuke is at the old school building. Filled with hope, Ryoko runs towards the old building, thinking of the peaceful days she used to have with Yasuke.

Chapters 11-12
It begins raining, but Ryoko continues to run full speed. As she arrives at the old school building, Ryoko once again notices that she can remember things more clearly. She is surrounded by security guards, but they soon split up and leave, leaving only one of them behind. The guard shows her a medal with Monokuma engraved upon it. With his hand, he shows Ryoko where to go, and then walks away.

Ryoko begins to feel afraid, as she realizes how everyone is just conveniently acting like ordered. She convinces herself that everything will be all right once she meets Yasuke. She believes in him and throws all her uneasiness away. Like the guard showed her, Ryoko crawls under the small opening in a fence and reaches the back side of the old building. She proceed down the entrance hall while calling Yasuke, but no one answers. She notices the place seems unnaturally dark and she then hears strange sounds in the darkness - the lights get turned on.

As she continues searching, she is suddenly startled by Yuto, who is behind her. Ryoko has once again forgotten him, but seems to remember him soon after he reintroduces himself. Yuto wonders how did Ryoko get past the guards, and she awkwardly answers that it kind of just happened. Yuto assumes she has just forgotten and doesn't ask more. He begins to boast how he managed to once again eavesdrop and learned that the old building and the current incidents are connected. Yuto is also the one who turned on all the lights. He mentions that Yasuke should be coming soon and he is annoyed because Ryoko keeps thinking about him.

The two keep talking as they walk down the stairs. Yuto explains about Izuru Kamukura and the Tragedy of Hope's Peak Academy. He mentions that the school hid the incident, but haven't yet dealt with Junko Enoshima. As the two reach the first floor, Yuto keeps talking about her and how she is probably responsible for the kidnapping of the Steering Committee. Hearing the words, Ryoko remembers the old men in the jail cells. She begins to space out, but Yuto calls her. There only seems to be walls, but Yuto then reveals that he investigated and found a suspicious spot. Using some sort of key he stole from the security guards, he uses it on a small opening in the wall. A door slides open and the two go inside a long passageway which leads to Izuru Kamukura's hiding place. When Ryoko asks about it, Yuto says that Yasuke will definitely show up. They find a simple elevator and go inside. Yuto assumes it was specifically made to hide Izuru's location.

As the elevator begins moving, Yuto appears very excited. Ryoko asks isn't he afraid at all and, despite the smile on his face, he admits he is actually terrified. He hasn't been so afraid before, but he claims it's fun, because he will develop even further as a spy and thus he can't run away. Ryoko asks why he is so persistent about his talent, and Yuto answers it's only natural to be fixated on it as it is the only thing he has. Because of his talent, he can't choose his lifestyle. He believes he has to continue struggling, because running away would be like rejecting his very existence. Yuto controls his fear by talking about how he will become a legendary spy if he solves the case, finally blowing away his lack of presence.

As the two reach their destination, Yuto mentions the Masterminds and accomplices. Ryoko assumes he means Mukuro, but he explains that he actually means Yasuke. Instantly, Ryoko is hit with strong shock, but Yuto does not notice this. He continues to talk about how Izuru isn't the real culprit and Yasuke is Junko Enoshima's assistant. Ryoko has trouble understanding anything, but then begins to have a chain reaction in her mind, as her mind links different things together. The two finally reach Izuru's hiding place, but it is empty. Suddenly, when Ryoko turns around, she finds Yuto with his neck broken and his head completely turned 180 degrees.

Then, Yasuke appears next to the elevator. He appears to feel bad for Yuto, saying that maybe he would've been spared from such a fate if he didn't meddle with Junko Enoshima's affairs. Ryoko doesn't recognize him and asks who he is. Yasuke is surprised and looks completely exhausted. Coldly, he asks why doesn't she remember him. Ryoko tries to explain that she easily forgets things, but she suddenly feels pain in her mind, as her original persona slowly begins to merge. Yasuke claims to be Izuru to test her memory and looks at her with sad eyes. Ryoko feels a bit afraid of him.

Yasuke says he has decided to talk a bit before he makes his decision. He explains that The Tragedy of Hope's Peak Academy didn't mean much for Junko, as her true goal was to brainwash the reserve course students. He says that Junko used him and the student council as sacrifices solely for that purpose. Yasuke says he didn't want to believe that she was so obsessed with despair, that he was only controlled for that purpose, and that he is involved with the incident. Yasuke then stares at Ryoko with deadly hatred, assuming that she has remembered that he wasn't a particularly important person to her, which made her forget him. Ryoko finally realizes that he isn't Izuru and angrily he tells her that he is Yasuke.

Chapters 13-17
Yasuke tells Ryoko that Izuru has been taken away a long time ago. Ryoko is surprised that he is Yasuke, because she doesn't feel her usual feelings for him, but she confirms it with her notebook and the way he speaks. Yasuke says that she has stopped thinking about him, because she has begun to remember other things. He says that his existence was never special to her and she only assumed that because she had forgotten that fact. Ryoko is confused, but then she begins to remember why she wanted to see Yasuke and how she used to act towards him. Unable to believe in anything, she begins stepping back and the wall blocks her way. Yasuke moves towards her and she feels afraid.

Ryoko tries to tell him that they should go back to how things were, but he says it's already too late and they can't go back. With a sad face, Yasuke explains that the school's tragedy made him realize that his life was just a fake scenario set up to control him. He was completely fooled by Junko, but he thought he could save her and stop her. In order to protect her, he concealed her existence itself. Regardless, she had the Steering Committee murdered, and Yasuke hid the corpses and dealt with the evidence for her sake. He confesses that he even murdered for her sake. Ryoko asks if she's that important to him and he answers that she is. Yasuke explains that the reason for that is the fact that she prevented him from being all alone after he lost his mother. She became the most important to him, even though he says she's not a lover, family nor even a friend.

When she hears how Yasuke feels about Junko, Ryoko believes she has no chance of competing with her. She lets out a deep breath and Ryoko's persona appears to begin to fade away. Suddenly, Mukuro disguised as Junko appears, saying that she just came to provide the supplementary explanation. Ryoko remembers Mukuro's face and Mukuro explains she has just been following Junko's orders. Yasuke understands that Junko anticipated his actions and he angrily says that she is now spectating his actions in amusement. Ryoko is confused by their words and is already incapable of understanding Yasuke's feelings. However, she understands that he both loves and hates Junko. Ryoko realizes that she can only give up and let her and Yasuke's world end.

Yasuke lets out a huge sigh and then, eyes brimming with determination, says that he must end this. He says that his desire to protect Junko was likely true despair and his despair won't end unless he ends this. He says he desperately tried to hide her and not have her involved with others, thinking he could protect her. However, it was pointless, as his actions meant nothing to Junko. In the end, she could only inflict despair on anyone involved with her. He says it's despair that he finally understands this.

Deciding to end everything, Yasuke attempts to strangle Ryoko to death, saying that it's for his and not Junko's sake. Once again, Ryoko hallucinates, seeing and hearing Junko's figure. As she imagines Junko's face, she finally remembers that it is her own face. At that very moment, "Ryoko Otonashi" stops existing, replaced by her original persona. Junko laughs, saying that Ryoko never existed in the first place. In a fit of despair, she kills Yasuke and continues preparations for the first mutual killing.

Super Danganronpa 2.5: Nagito Komaeda and the Destroyer of the World
Ryoko appears in the ova as a part of Nagito' imagination world.

Yasuke Matsuda
Ryoko is deeply in love with Yasuke. He is the only person she can remember more clearly, though it is only about her feelings for him, not things like his appearance or what they've done together.

Yuto Kamishiro
At first, Ryoko assumes Yuto is as innocent and pure as he looks, and she has a hard time understanding that he is actually very perverted. Ryoko is also a bit annoyed with Yuto's somewhat arrogant and careless attitude, while Yuto is annoyed by her forgetfulness and seemingly a bit dumb demeanor.

Yuto helps Ryoko to solve the incident she has gotten involved in, expecting to have sex with her as a reward.

The two are noted by Yuto to have bad chemistry, because Ryoko is forgetful while Yuto is easily forgettable. Yuto says that he prayed to god that they'd be a good combination.

Junko Enoshima
Ryoko is terrified of Junko, not understanding the connection between the two of them. She is furthermore confused by Mukuro, who disguises herself as Junko and pretends to be her.

Makoto Naegi
Ryoko dislikes Makoto a bit and finds him suspicious due to his very kind personality, assuming that he's actually a pervert behind his nice demeanor. She can also tell he's very ordinary when compared to other Ultimates, to the point that it's abnormal. She was ready to let him die at the hands of Isshiki Midarai, as she always believes that other people have nothing to do with her, claiming that it was due to Makoto's bad luck that he ended up that way.

Later, however, she is impressed and feels burning uneasiness about Makoto, because she can sense an incredible strength deep inside underneath his "unreliable and weak" demeanor. Though she doesn't realize it, it's his Ultimate Hope, and it's implied this is Junko's genuine feeling about Makoto. However, due to Ryoko's short term memory loss, she quickly forgets his existence completely.

Quotes

 * “Um, it seems my name is Otonashi Ryoko… maybe?”
 * “D-Don’t lie! I’m not ugly! I’m cuter than most people in this world!” (to Yasuke Matsuda)
 * “This has nothing to do with me!”

Trivia

 * Her first name, "Ryoko" (涼子), means “Refreshing child” while her last name, "Otonashi" (音無), means “no sound”.
 * Her last name, Otonashi, is very possibly a reference to the main character of Angel Beats!, Yuzuru Otonashi (音無 結弦 Otonashi Yudzuru), who by the beginning of the series has no memory of who he is.
 * Yuzuru Otonashi also has the exact same hair color as Ryoko.
 * Her first name, Ryoko, is probably a reference to the character Ryoko Asakura (朝倉 涼子 Asakura Ryōko) from the Haruhi Suzumiya series. This reference is also a hint at the end of Danganronpa/Zero and Ryoko's "death", considering how both characters' demises involve very similar events, yet in different sequences.
 * Ryoko Asakura tries to kill Kyon - a main character and the narrator of the Haruhi Suzumiya series - using a knife so as to trigger a reaction from Haruhi Suzumiya (of whom Kyon is a speculated love interest) herself, and is killed (though not in the conventional sense) in the failed process.
 * Conversely, after Yasuke successfully triggers the sealed off part of Ryoko Otonashi's psyche by imitating Izuru, the latter enters a fit of despair and kills the former (who was her own love interest) with a knife. At this point the memory alteration placed upon Ryoko is removed and her original identity is restored, effectively causing the "death" of the individual who was known as Ryoko Otonashi.
 * Ryoko's notebook is obtainable in Danganronpa 2: Goodbye Despair as a present. The notebook has a ragged appearance and states "Ryo… ashi… emory Notebook" on the cover. Although the contents of the notebook have become illegible, it most likely contained a recollection of the events that transpired during Danganronpa/Zero.
 * It has been stated that Ryoko resembles Yasuke's late mother a lot, both appearance-wise and the way they both had memory issues.