Tsukaji Yuuri

She is a cheerful and friendly career office lady. She loves cute guys. On the other hand, she has no interest in men her own age. She and Kyouko were senior and junior members of the volleyball club when they were students.

She has never been keen on practicing volleyball, but when Kouta comes as a temporary coach, she is suddenly motivated to seduce him because she likes Kouta's looks.

She loves to teach sex to young boys and is planning to teach the protagonist how to do it, if she gets the chance.