The brother of an up-and-coming kendoka is mysteriously murdered while working on a new model of motorboat.
| Actor | Role |
|---|---|
 Teruhiko SaigōKenji Hoshikawa | Kenji Hoshikawa |
 Tetsuya WatariSaburo Ohinata | Saburo Ohinata |
 Yukiyo ToakeMari Takakura | Mari Takakura |
 Chieko MatsubaraShizuko Inagaki | Shizuko Inagaki |
| RRyuji KitaHideki Inagaki | Hideki Inagaki |
 Isao TamagawaIwakichi Mori | Iwakichi Mori |
 Takashi KandaYusaku Amemiya | Yusaku Amemiya |
 Kaku TakashinaMankichi Yamaarashi | Mankichi Yamaarashi |
 Tomoko NaraokaMichiyo Amemiya | Michiyo Amemiya |
 Minako KatsukiKikuko Ohinata | Kikuko Ohinata |
 Yōko NakaNot listed | Not listed |
 Nobuo KawakamiNot listed | Not listed |
| EEiko TakadaNot listed | Not listed |