A sudden increase in odd killings. A world close to an end gives rise to an unprecedented master detective!!! The story follows the motivated detective Asano Misaki & her slacker partner Hijirihara Takumi. They work in the Special Crime Investigation agency (SCI), which is in charge of cases judged abnormal or bizarre. Note: In the middle of chapter 3, it was revealed that Killer Killer is an official side story of the Danganronpa series, taking place after Ultra Despair Girls - Danganronpa: Another Episode and before Super Danganronpa 2: Goodbye Despair Academy.