An incident of backdoor admission occurred at a cram school. Instructor Yukino happened to witness the scene. Later, someone's internal whistleblowing led to the arrest of those involved in the backdoor admissions, and the cram school went bankrupt as a result. Yukino started anew at a different workplace but was attacked by someone on her way home and imprisoned in an underground dungeon. As she is tormented and cries for help, a woman appears before her hazy vision—the wife of the principal who was arrested for backdoor admissions, standing there with a face full of rage. The humiliation begins, as the stupid parents' revenge enema party commences!
