Seifuku Shojo The Animation – Episode 2

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)

Alternative
Seifuku Shojo The AnimationVirgin in the School Uniform制服処女 THE ANIMATION제복처녀