Houkago: Nureta Seifuku

Shibui Ryuji is a teacher of a girl school whose students are born in well-off families. All students hate him because of his figure and perverted nature. However, he happens to know the weakness of Tenkawa Ayumi, so he raped her. Tasting blood, he begins to rape his students, one after another taking advantages of their weakness.
(Source: AnimeNfo)