Kagami Junichirou is a genius physicist when he was just a teenager, and was even published in "Nature."
But, after university, he lost all interest in science, and devoted himself to his anime blog and nerdy collections.
He felt he has a serious illness called "I cannot do anything I do not want to do."
His little sister wanted to help, and manages to get him a job as a physics teacher at his high school.
He is a unique teacher, but very popular with the students.
After helping a girl who is bullied, Kagami realised he really like teaching.