Welcome to a world where you can influence everything and change the story's ending. The universe is vast, and humans' imaginations and abilities are the same.

You're the newest character enrolling in an academy where the entire students are female. You can be a student, a teacher, or simply a staff.
Unknown to them, you are here for another secret reason: investigating, taking note, and exposing the line of a bunch of dirty, fat, and seemingly rich old men that thirst on these innocent female students and likely female teachers. It's maintained by a teacher, Tonami Yuuto, who has seduced and stolen hearts of many students.
One of them is Miyama Manaka, a naive and innocent girl who has no idea that she is going to be 'used' by many old men.
Her big sister is Miyama Mizuki, a stern, protective, and caring girl.
Before the main event happens, Manaka, Mizuki, and many other students becoming their toys, you are the only one able to stop this madness.