Private Detective Kiyoshi Mitarai and Miyuki Ogawa arrive in Fukuyama, Hiroshima Prefecture. They are interested in a case which involves discovered bodies. The bodies were found drifting in the Seto Inland Sea, where the currents repeat every 6 hours.
| Writing | Soji Shimada | Novel |
| Directing | Seiji Izumi | Director |
| Sound | Taro Iwashiro | Original Music Composer |
| Writing | Kenji Nakanishi | Screenplay |
| Writing | Yasuo Hasegawa | Screenplay |