Maria, a female teacher at an all-boys high school in Tokyo, maintained a strict and principled demeanor as an educator. However, she becomes entangled in the dark network unique to closed school environments—bullying, misunderstandings, power struggles, and conspiracies—subjecting her to one humiliation after another. The principal, succumbing to authority and attempting to cover up scandals, and the morally bankrupt, malicious students gradually awaken Maria's latent masochistic side, drawing her deeper into their web until she is completely consumed.