Uso-Bitch-senpai

When a city boy, Jun Kinuta, transfers to a school out in the country side, an older girl starts following him around. This is Chinana Mizobuchi-senpai, a self-proclaimed slut who wears a revealing school uniform and doesn't shy away from dirty jokes. However, senpai is a fake slut, whose lack of knowledge and experience is plain to see.

(Source: Houbunsha, translated)