The protagonist is a veteran teacher of world history with twenty years of experience as an educator. While guiding his students as a teacher, he also has an abnormal sexual appetite and enjoys repeatedly subjecting female students he has his eye on to obscene training and corrupting them. Aosaka Academy, where he will be assigned this year, is also the place where the protagonist first trained a female student when he was a new teacher. Returning to his old school after many years, the protagonist has already set his sights on one female student. Saki Morimiya. Beautiful, academically excellent, and the perfect honor student, she is the perfect prey. In order to get his hands on Saki, the protagonist transforms the old, unused school building into a training facility and makes the preparations. And so, after a decade or so, the nostalgic school building once again becomes the setting for a lewd and gruesome training drama.