Danganronpa Gaiden: Killer Killer

Danganronpa Gaiden: Killer Killer (ダンガンロンパ 害伝キラーキラー Danganronpa Gaiden Kirā Kirā) is a manga spin-off connected to Danganronpa 3: The End of Hope's Peak Academy. The official timeline of Danganronpa events places it after the events of Danganronpa Another Episode: Ultra Despair Girls and before the events of Danganronpa 2: Goodbye Despair.

The manga was released on March 8, 2016 in Bessatsu Shōnen Magazine April issue. The original concept was made by Spike Chunsoft and the scenario was created by both Kazutaka Kodaka and Yōichirō Koizumi.

Synopsis
In response to The Biggest, Most Awful, Most Tragic Event in Human History, an organization called Future Foundation was created to combat the chaos still present even after the death of The Mastermind.

Misaki Asano is a new recruit, working as a special investigator for the 6th Division's Special Case Bureau--a branch dedicated to only the most bizarre and challenging murder cases. Alongside her partner, Takumi Hijirihara, they aim to combat despair one case at a time.

Though, perhaps their most challenging case is that of the mysterious Killer Killer, a bizarre serial killer targets other murderers.

Future Foundation's 6th Division

 * Takumi Hijirihara
 * Misaki Asano
 * Juzo Sakakura
 * Ikue Dogami
 * Mekuru Katsuragi
 * Kenji Tsuruhashi

Future Foundation's Members

 * Kyosuke Munakata
 * Kyoko Kirigiri
 * Ruruka Ando
 * Sonosuke Izayoi

Serial Killers

 * Momomichi Ito
 * Rei Shimizu
 * Ted Chikatilo
 * Eiichiro Saiyama
 * Mimiko Tomizawa
 * Mukuro Ikusaba
 * Shuji Fujigawa

Supporting Characters

 * Ultimate Make-up Artist
 * Junko Enoshima

Minor Characters

 * Kinari Kunugida
 * Sakuma Fujii
 * Chusuke Oyama
 * Nobuo Takeda

Trivia

 * Several deaths from the Danganronpa: Trigger Happy Havoc are referenced in Chapter 3.
 * The Volume 1 cover art is also a reference to this, showing Hijirihara dead in a similar style to Sayaka Maizono.
 * The Volume 2 cover art is yet another reference, showing Asano in the death position Chihiro Fujisaki was previously in.
 * Sparkling Justice, the Spanish serial killer mentioned in Danganronpa 2: Goodbye Despair, is referenced in Chapter 3 of the manga.
 * It is also heavily implied that Sparkling Justice and Killer Killer are the same person. Whether they are or not however is unconfirmed.