Kanojo wa Tsunderu Fuukiiin

Yuu Kashiwagi is a member of the student council, as leader of the public morals division. She is uniformly hated by the school's student body.
Kota Minami, who is also in the public morals division, is something like Yuu's personal slave.
However, the two of them are also childhood friends... What's more, they're actually betrothed!

This game depicts their loving, erotic affairs after school.

[From DLsite English]