The story centers around the life and friendship of the 689 Trio (songwriter Nakamura Hachidai, lyricist Ei Rokusuke and singer Sakamoto Kyu).
| Actor | Role |
|---|---|
 Junichi OkadaHachidai Nakamura | Hachidai Nakamura |
 Tori MatsuzakaRokusuke Ei | Rokusuke Ei |
 Taiga NakanoKyu Sakamoto | Kyu Sakamoto |
 Nana SeinoJunko Nakamura | Junko Nakamura |
 Mone KamishiraishiAlice | Alice |
 Riisa NakaMasako Ei | Masako Ei |
 Tao TsuchiyaYukiko Kashiwagi | Yukiko Kashiwagi |
 Riho YoshiokaTetsuko Kuroyanagi | Tetsuko Kuroyanagi |
 Tomoya MaenoKiyoshi Atsumi | Kiyoshi Atsumi |
 KogakenNorihei Miki | Norihei Miki |
 Hiroko YakushimaruIku Ooshima | Iku Ooshima |
 Hiroshi AbeProducer Nabeyama | Producer Nabeyama |
 Junki TozukaDirector Busujima | Director Busujima |
 Rikako YagiNot listed | Not listed |
 Lilas IkutaNot listed | Not listed |
 Kai InowakiNot listed | Not listed |
 Maho YamadaNot listed | Not listed |