Masaya gifted student, works part-time as a tutor. One day, he receives a package. This workbook. He frowns when he reads the letter, which is attached to the parcel. It says, "If you write in a notebook woman's name, you can manipulate it as you want." First, he takes it as a joke, but decided to try it. He inscribes the name of Yumi, his students.... As a result, it comes true, and it is moving closer to her. "This book is really capable of it. Now with this I can have fun...."