One day, high school student Shunsuke Ohta comes across a man that looks exactly like himself, who commits suicide at a train station. The next day, Shunsuke is abducted on his way home from school. When Shunsuke wakes up after that, he finds himself inside of a cage. There, various torturers gather and compete to see who can make their target confess their secrets the fastest in the "Torture Tournament." Shunsuke battle against the "White Noble" and the "Black Moon" begins!

Three years ago, a high school boy who had been the subject of relentless bullying carried out a suicide bombing that killed all but seven of his classmates. Now the survivors have gathered to finally put an end to their own torment.