Chinmoku no Jogakuen ~Abikyoukan no Nikuyoku no Utage wa Owari o Miseru no ka~

Kamimori Akio is a new teacher at the Seiryo academy, a private school for young ladies of prominent families. He lives with her younger sister who also goes at the academy as him. He does a good job as a teacher and has gained the trust of both students and the academy's principal, however Akio has a problem that he cannot tell to anyone. Which is a type of "unnatural libido" that makes his regular life weird. Whenever he sees an attractive woman's body, he tries to hold his desires to rape her and goes to an abandoned toilet to jerk off, doing his best to be "the good new teacher" for months. However, his twisted daily life... ended up in one instant after he was discovered by a woman. Niinami Mizono, an strange female teacher that came to the academy a little earlier than Akio, carries out an unprecedented "school hijacking" incident. And now, the curtain for a party of madness opens...