Seifuku Shojo the Animation

The anime itself depicts teen-aged (and well endowed) school girls getting raped - by her teachers (the first episode), by some "businessmen" who mistake the girl for a hooker (the second episode), by a class mate in mad love with the girl (third episode) and finally two sisters being raped by the school janitor.
(Source: AniDB)

Episode List (2)

Facial 79% Episodic 79% DILF 79% Large Breasts 79% Public Sex 79% Bondage 60% Anal Sex 60% Fellatio 60% Defloration 60% Rape 60% Nakadashi 60% Inseki 40% School 40% Cosplay 40% Sex Toys 40% Yuri 40% Maids 40% Cumflation 40% Incest 10%