Sensei has the ability to control people's actions by writing about it in his notebook. He decides to use this ability on a female friend who he is tutoring. But that's not enough—he uses it on her sister and mother as well, even letting some of the other male students join in.

Masaya is a university student, who works as a home tutor part-time. One day, he receives a parcel. That is a notebook. He frowns when he reads a letter, which is also in the parcel. It says, "If you write a girl's name in the notebook, you'll be able to control her as you like." He thinks it is ridiculous at first, but he decides to give it a try. The name he writes is Yumi, his student.... As a result, it comes true, and he shags with her. "This notebook is proved to be real. I can now have fun with it...."