Mikio's homeroom teacher, Mio, is concerned about him and regularly visits his home after he stops going to school due to bullying. Mikio continues to stay at home and refuses to go to school, but his gratitude towards Mio gradually turns into love. When Mikio's foolish older brother, Taka, finds out about Mikio's faint feelings of love, he smiles maliciously and plots to trample on Mikio's feelings.