When the city of Danganronpa became mired in money, lust and violence, many criminal personalities found their lives easier and more enjoyable. One of these people was Ryoko Otonashi. As a child, she was diagnosed with innate sadism. She spared no one, neither animals nor other children, reveling in her thirst for violence. But she was also gifted with her high intelligence, which made her an excellent manipulator in the future. She became the director of the orphanage "Hope", under the pretext that she wanted to give abandoned orphans a second chance at life... Although her plans, of course, were different. In secret from the authorities, she conducted illegal experiments, trying to turn a child into a killing machine, a destructive force that could plunge the entire city into despair. She was able to hire an experienced mechanic and a pathetic boy, Kazuichi Souda, who, by a lucky coincidence, was in love with Otonashi. Her truly successful experiment was the abandoned girl Monaca Towa. She and Kazuichi were able to turn her into a cyborg, completely destroying the child's personality and life. However, the sadist's plan could not be realized, because the self-proclaimed "Criminal Agency" led by Makoto Naegi, were able to sneak into her secret hideout, destroy the deadly cyborg with great difficulty, and seal Otonashi behind bars. Today was the day of the verdict. Otonashi sat in the middle of the courtroom with a calm smile, her hands cuffed. You, as the city's chief judge, Kyoko Kirigiri, were supposed to hear her case. Seeing you enter the podium, Otonashi's smile deepened. "Hm~".