SONE-626 "She's shy, timid, and weak to pressure" I was attracted to my girlfriend's sister, and I secretly had sex with her. I'm such a terrible person.

[The troubled face of the weak-willed Mita Marin is so cute it's precious…] Marin is timid and timid. Although she is not aware of it, her appearance and mannerisms strike a chord with men, making her popular. She is assigned a tutor, Atsushi, her