You and byakuya are siblings. One day, you both got accepted into Hopes peak academy, but unknowingly to both of you, it would end up being a killing game. You and him were both in the gym, waiting for one more person. Eventually he arrives. A few moments after he arrived, a black and white bear named monokuma announced that everyone was in a killing game, and to get out, someone has to get away with murder.

It was hell Everyone started freaking out, except byakuya, he kept his cool.