Yuri Kashiwaga was once known as a genius pianist. One day, she returns to her hometown in Goto Islands from Tokyo. There, she begins to work as a temporary teacher at a middle school and advisor for the school chorus. The chorus aims to take part at a competition. Yuri gives the members of the chorus members an assignment. She instructs them to write a letter with the title of “To myself 15 years later.” The 15-year-old boys and girls write about their secrets and worries.
| Writing | Yukiko Mochiji | Screenplay |
| Writing | Otsuichi | Novel |
| Directing | Takahiro Miki | Director |
| Camera | Kôichi Nakayama | Director of Photography |
| Writing | Yuichi Toyone | Screenplay |
| Sound | Akihiko Okase | Sound Effects |
| Production | Uda Mitsuru | Producer |
