Masaya is a student, who works as a tutor. One day, she received a package. That is a notebook. He frowned as he read a letter, which was also in the package. It said, "If you write a girl's name in a notebook, you will be able to change as you like." At first he thought this was ridiculous, but he decided to help him. The name he wrote was Yumi, his student ... Trying, it was a challenge, and he made love trying. "This notebook is proven to be real, I can now have fun with this ...