An incident involving illegal backdoor admissions at a cram school. Instructor Yukino accidentally witnesses the scene. Later, due to an internal whistleblower, those involved are arrested and the school goes bankrupt. Starting fresh at a new workplace, Yukino is attacked on her way home and imprisoned in an underground cell. Tormented and pleading for help, she finds herself face-to-face with the enraged wife of the school director—arrested due to the backdoor scandal—who blocks her escape with a furious glare. The situation takes a dark turn as a humiliating degradation begins, culminating in an enema party as revenge by the vengeful, deranged mother and daughter.