Ikuya is an honour student who has been top of his class for three years. However, due to pressure from his parents, he is unable to play with his classmates and spends his days in depression.
The only thing Ikuya looks forward to in these days is a reward from Mr Katsuragi when they are alone together. One day, in the middle of his reward, he looks out of the window and sees a shadow!
The next morning, Baba, a yankee who happened to witness Ikuya and his teacher's 'reward', stops him. He also asks him, "I won't tell anyone about your relationship with your teacher, so why don't you play with me too?"