Riko, a young wife, got married soon after graduating from school. Her husband, Takuma, was her homeroom teacher when she was a student, and they had been dating in secret. Although it was a secret relationship, their relationship was pure. They had sex for the first time only recently. Now they live modest but happy lives. One day, absurdity suddenly strikes. A gangster named Ito moves into the room next door and starts to make trouble for them, and the two of them are sent to the depths of hell...