Original title: 恥辱シスター 「主よ、淫らな私をお許し下さい。」
Takumi comes back to his hometown after ages. Takumi's brother passed away ten years ago, his wife Manami and her cousin Mitsuko are both working as nuns at the local church.
Takumi is feels attracted to them and they are also attracted to him because he looks just like his late brother. Seems like there used to be the love triangle among Takumi's brother, Manami and Mitsuko....