Kimishira has been in love since childhood with his neighbor, Rin Kazama, who is much older than him. Rin treated little Kimishira fondly, but as the years passed, the boy grew up and Rin's attitude toward him changed, becoming more cool. Kimishira's feelings didn't change, he still loved Rin, who by then had become a teacher and was teaching at the school where Kishmira was studying. Kishimira decided to open up to Rin and sent her a love letter...