The 4th episode, Reina was about to gangraped by her ex boyfriend, but our perverted come to rescue our tsundere girl. Though Reina can’t get rid of her frustation towards the pervert doctor, she was filled with jealousy when she sees the doctor using his cock to pleases ayano chan, her best friend. Well she’s tsundere afterall. Hence that day she has decided to become part of his harem.