The Nagatas are a dysfunctional family of disturbed individuals. Both parents are neglectful and selfish, while the oldest daughter Asuka is a bully. Only the two younger children, a boy Akira and a girl Arina, are decent. However, Akira cannot go through with Ai's contract, afraid to go to Hell. The children's older cousin, Yoshinori, proves to be the worst by far, as he is a violent psychopath who is implied to be involved with his cousin Asuka and tries to molest his youngest cousin Arina as soon as he moves with them...