Koromo Kanade

Skills: piano
A girl who loves masturbation so much it makes it hard for her to concentrate on her piano practice. With an upcoming competition she allows Tetsuya to have sex with her in an effort to relieve her stress. Insists they're only sex friends and refuses to confess that she likes him.

Spoiler

However she only has sex with Tetusya on days she's ovulating, insisting it's because raw baby making sex feels the best.