As the Gods will, 1

Shun Takahata is fed up with the monotony of life, but things suddenly change one day when, in the middle of class and without warning, he and his high school classmates witness the teacher's head explode. At that moment, a mysterious daruma doll appears before them and forces them to participate in what at first glance seems like innocent children's games. However, the reality will leave them stunned: those who do not follow the rules of the game or those who lose the game will die horribly on the spot. Bewildered and without understanding the reasons for this sadistic plan, the students will risk their lives to survive, even if it means putting aside their humanity and betraying their childhood friends.