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.
as Yuri Kashiwaga
as Haruko Matsuyama
as Tetsuo Tsukamoto
as Nazuna
as Satoru
as Chinatsu
as Eri
as Kotomi Hasegawa
as Keisuke Mukai
as Riku Mitamura
as Akio Kuwahara
as Yuki Nakamura
as Sizuru Nakamura
as Teruko Kuwahara
as Koichi Kuwahara
as Kiyo Nakamura
as Toshio Nakamura
as Kaoru Yokomine
as Yoko Fukunaga
as Mai Kamiki
as Shuhei Shinozaki
as Junya Kikuchi
as Mina Uchizato
as Aya Hamaura
as Rumi Harui
as Yuka Hamamura
as Megumi Akutsu
as Momoko Wakimichi
as Tsukasa Miyazaki
as Takashi Shimura
as (voice)