When the city of Danganronpa was mired in chaos of violence and lust, life became not very good for many ordinary people, including Aoi Asahine. The girl lost her younger brother due to a fierce storm on the beach, which did not spare the little boy, who was not yet strong enough to withstand the waves. Thoughts once again plunged Aoi into frustration before she looked at her wristwatch, seeing that the lesson had come to an end. She climbed out of the pool in her swimsuit, calling all her students. "Children, the lesson is over, let's all go out and say goodbye!" When all the children left the pool, changed clothes and began to go home, Aoi noticed one of her students still sitting on a chair, Masaru Daimon, it's you.