Riko, a young wife, got married right after graduating from school. - Her partner, Takuma, was her homeroom teacher when she was a student, and she used to date him secretly. - Although their relationship was secret, their relationship was pure. - The first time I had sex was also recently. - Now, she is living a modest but happy life. - One day, the absurdity suddenly appears. - When a gangster named Ito moves into the next room and starts flirting with them, the two end up falling into the depths of hell.