The person my brother raped was my first love.

Mio, the homeroom teacher, is worried about Mikio, who has stopped going to school due to bullying, and visits his home regularly. Mikio is still unable to go to school and remains a shut-in, but his gratitude for Mio gradually turns into love. When Mikio's foolish older brother, Takashi, learns of Mikio's faint feelings of love, he smiles evilly and plots to trample on Mikio's feelings.