I'm Secretly Fucking My Girlfriend's Mom Behind Her Back — Hana Haruna

This is a web of family secrets and betrayal. The story follows a man who, while in a relationship with his girlfriend, becomes involved in a secret and forbidden affair with her mother, played by Mao Hamasaki. The film focuses on the emotional tension and the high-risk nature of their hidden relationship as they navigate the consequences of their actions.

The protagonist has started a high-risk secret affair with his girlfriend's mother, the seductive Mary Tachibana. While the daughter is away, they indulge in their forbidden desires, risking everything for the thrill of the betrayal.

The narrative is centered on a complicated and secret relationship involving a protagonist, his girlfriend, and his girlfriend's mother. The story focuses on the tension and risks associated with a hidden affair within a family.