A young wife, Riko, got married right after graduating from school. His partner, Takuma, was a teacher who was in charge of him when he was a student, and he used to go out with them in secret. It was such a secret relationship, but the relationship was pure. The first sexual intercourse was also recent. Now I am living a modest but happy life. One day, absurdity suddenly comes. When a mobster named Ito, who moved into the next room, comes along with a flirt, the two of them fall to the bottom of hell...
