牝辱の穴ウメ ～学園報復戦争～

The setting is a boarding school deep hidden in the mountainside completely isolated from the rest of civilization.

As this school follows a policy to treat scholarship students much more favourably than their average students, a considerable rift has formed between these two groups.

Inside the school, a student who got brutally raped and who was left in a horrific state is being discovered.

A group of ordinary students come to the conclusion that it must have been the scholarship students who had committed the crime and set out in retaliation to punish in the same manner and make one member of the opposing group experience the same fate.