SONE-626 I became aroused by my girlfriend’s shy, timid, and easily persuaded younger sister, and secretly kept getting involved with her. The worst version of me. Mita Marin

Mitsurin Mita’s shy, troubled expression is just too cute…

Mitsurin is timid and introverted. Unaware of it herself, her looks and mannerisms naturally attract men, making her surprisingly popular. One day, she gets a private tutor: Atsushi, her older sister’s boyfriend. He has his own worries. Even though they have been dating for quite a while, Mitsurin’s sister is very strict and never lets him get close to her. Compared with that strong-willed sister, Mitsurin seems gentle and easy to persuade. Atsushi, on the verge of losing control of his desires, ends up making a move on the younger sister. But Mitsurin… accepts it. Realizing that she is weak to pressure, Atsushi’s lust only grows stronger and stronger…