[SONE-626 English Subbed] – “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.

SONE-626 English Sub – Marin is a shy and timid girl who unknowingly attracts men with her appearance and mannerisms. She is assigned a tutor, Atsushi, who happens to be her sister’s boyfriend. Atsushi has been frustrated in his relationship with Marin’s sister, who has not allowed him to have sex with her despite their long-time dating. He sees Marin as an easier target due to her weaker personality compared to her sister. Atsushi makes a move on Marin, and to his surprise, she accepts it. As he realizes Marin is susceptible to pressure, his desire for her intensifies.