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.
Yui Aragaki
Fumino Kimura
Kenta Kiritani
Yuri Tsunematsu
Shota Shimoda
Wakana Aoi
Kyoka Shibata
Mayu Yamaguchi
Hayato Sano
Hibiki Muroi
Daichi Watanabe
Hidekazu Mashima
Hikari Ishida
Tae Kimura
Shigemitsu Ogi
Kazue Tsunogae
Hisashi Igawa
Fuyuna Asakura
Mahiru Ueta
Nana Takahashi
Kyohei Kanomi
Shoya Miura
Rina Uchi
Ayano Hamaura
Kiina Haruno
Yuka Nakamura
Natsumi Abe
Moe Wakiuchi
Kanon Yamazaki
Takashi Tamura
Ryohei Suzuki