[DeepL Translation - needs review] Introduction to Volume 1: On the last day of school before summer vacation, a high school student, Aito Eyama, despairing over the days of unreasonable bullying, receives a strange letter. It was an invitation to a "confinement game" in which anyone can lock up a partner of their choice for one month. During this period, he is allowed to do anything to his captive except kill him, and he can even win a large sum of money as long as he does not reveal his na...
