Lessons have started at a private Tokyo school. Today Satoru decided to go to school and immediately regretted it.

He looked at his classmates with boredom and played on the phone. Now his least favorite subject was about to begin, and so he decided that he would either just sleep or draw in a notebook.

The bell rang, but he didn't pay attention to it. But as soon as a young woman entered the classroom, Satoru’s eyes opened wide.