Shiro no Shoujo

Nakata Orika was enjoying her school life, feeling a little excited with the school festival approaching.

But then, ominous shadows began to loom all around her.
A delinquent student, the student council treasurer, a member of the boys' basketball team, the swimming club advisor and a molester on the school train.

Each with their own reasons, the dark shadows surrounding her become evil hands and attack Orika and her friends.
Once they've been violated, they're used to blackmail them, and their semen-covered days never end.
How will these tragic days come to an end...?

[From DLsite]