Sirius Astronomical Observatory Murder Cases

The Sirius Astronomical Observatory Murder Cases are one of many events hosted by the VCC and the first and final Duel Noir cases featured in the first and seventh volume of Danganronpa Kirigiri.

The participants of the first Sirius Observatory Murder Case are of the Detective Library, with Tadashi Asakura and Tōkichirō Endō acting as the Allurements of this case.

The participants of the seventh parallel are four members of the Detective Library, with Mikado Shinsen, Tōkichirō Endō and Yuhain acting as the Allurements of this case.

Volume 1
The Sirius Astronomical Observatory Murder Case is hosted by Tōkichirō Endō; Tadashi Asakura is the Culprit selected and responsible for the murders that occurred inside the Sirius Astronomical Observatory. Tadashi first meets Tōkichirō in a park who tells him about the organization and then says that he will reveal to him the identity of the real criminal of the one who murdered his family under one condition. Tokichiro begins to tell him about Catharsis and, to get it, he must play a game called a Duel Noir, along the way telling him different rules. Having finished with all the rules, Tokichiro says that he cannot tell him who the criminal is, until he agrees to participate in the game and gives him one night to think it over and asks him to come to the park at ten o'clock in the morning. Tadashi accepts and says goodbye to the old man.

Five detectives are contacted to solve a case located on the Sirius Observatory who all first arrive at Hatesaki Station. Yui Samidare (DSC 888), Kyoko Kirigiri (DSC 919), Eigo Amino (DSC 367), "Shīta Enbi", and Kō Inuzuka (DSC 943)— were the detectives who were called to the case. The Detective group later arrived at the Sirius Astronomical Observatory and started to investigate the building and its furnishings. However, Yui along with the other detectives was tricked as the client never showed up, but instead, they ended up in another situation.

Later when Yui and Kyoko woke up, together they investigate the mystery surrounding the Observatory. The culprit, Tadashi is later revealed when he surrenders in front of Yui and Kyoko after the latter threatens to burn the building to the ground, to which they find him hiding in a small chair. Yui asks him who he is, to which he replies that his name is Tadashi Asakura. Tadashi confesses that he killed three people and lost, and later says that he sent an order on behalf of Ooe Yoshizono to five detectives to collect them in this place. He also adds that in Shita's letter, he indicated the time of gathering a little earlier to call him in advance before he killed, dismembered, and hid him in the telescopes and the chair, while he pretended all this time to be Shita and did not let anyone go to the telescopes. Tadashi was surprised that a novice detective like Kyoko was able to defeat him and asked her when she first noticed that the chair in which she sat, hid him, to which she says that this was part of her analysis from the very beginning.

Volume 7
Both Tōkichirō Endō and Mikado Shinsen hosted the final parallel, and intitially, Yui was called upon a meeting with Tōkichirō, with the old man wishing she would make a decision regarding the offer and the results of her sister's murderer. At first she conemplates taking revenge and accepting the offer to assemble her deck, but she waits until Tōkichirō's assigned time in which she returns with her decision.

A little time before the designated meeting, Samidare meets Mikado Shinsen, in which they converse a little regarding her intent and the role she will play, with her refusing to take the role as the 'Victim'. Mikado talks about the intent of him and the VCC, stating that he created the Committee to 'save' others he couldn't save himself, and to eventually uncover someone who would be the "Ultimate" Detective. He also states that she should cut off her emotions, and help Kyoko 'save' the future- Speaking of Kyoko in a way and how she can change the world, seeing the potential in her. He also stated that she would be taken out if Yui were to reject the assigned Duel Noir.

Yui contemplates 3 options-

1) To accept the offer and risk losing herself,

2) To reject the offer at the cost of Kyoko's life, or

3) To kill Shinsen right here and now.

While those thoughts has passed through her mind, Mikado speaks up that even if he would get killed, the Committee would still flourish and operate in an 'automatic' state. He opens his handkerchief to reveal a silver blade, in which he aims it at his temple to prove a point that Yui will do anything for Kirigiri and just as she screams for him to stop, Mikado ends his life. Another man, Fuhito Kirigiri, rushes over and concludes that indeed he is deceased, in which Mikado lays lifeless at the bench. Yui leaves the scene to a train, in which she meets Tōkichirō Endō again, informing him of her decision.

Kyoko and Yui make preparations and they are dropped to the location, then meeting 3 other people: Yukimura Shiroko - DSC 880, Kadomi Senshi - DSC 920, and Yuhain.

1st Case
Location: Sirius Observatory- 30 million yen

Weapon: Large shears- 5 million yen

Weapon: Fainting drugs- 5 million yen

Trick: Dismemberment- 80 million yen

Total Cost - 120 million yen

The Assigned Detective for this Noir is Yui Samidare.

7th Parallel
Location: Sirus Observatory - 1.5 billion yen

Weapon: Carbidotoxin - 30 million yen

Weapon: Paralytic - 10 million yen

Trick: ‘Behind closed doors’ - 400 million yen

Other: Cash - 100 million yen

Other: Chains - 50 million yen

Total cost - 2.14 billion yen

The Assigned Detective for this Duel Noir is Kyoko Kirigiri.

Volume 1

 * Yui Samidare and Kyoko Kirigiri become detective partners and eventually form a friendship.
 * Finishing the Observatory Case, another Duel Noir was about to be hosted at Norman's Hotel, discovered by outside means of directly messaging another registered detective through the DSC.
 * Tōkichirō Endō, although 'participated' indirectly, scouts and allures under orders to a parallel Duel Noir in Volume 7.

Volume 7

 * Kyoko wakes up in a hospital with both her hands bandaged, with the presence of Salvador Fukuro Yadorigi and the Innocents of the 'Libra Girls' Academy' welcoming her. They reiterate on the conditions she's suffered along with Samidare's fate.
 * Fuhito Kirigiri is put under police investigation upon suspicion of killing Mikado Shinsen.
 * Upon visiting the Detective Library, Kyoko's DSC ranks up from 912 to 910, and even with her goals of obtaining a Zero she does not feel any accomplishment or happiness as a result. She then finds Yui's note under an unrelated file with her birthday and a poem written on it.
 * Salvador states that the Committee is still operating and requests her help, in which she accepts after some mourning and contemplation.
 * A few years later, Kyoko was scouted into Hope's Peak Academy; She receives a message from a client and proceeds to leave but collided in the halls with Makoto Naegi. He picks up her fallen DSC card and tells her what he knew about the neighboring case, with her curiosity of the boy blooming.