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.

• Toei Company
• Crossmedia
• Hiroshi Tamaki
• Alice Hirose
• Hikari Ishida
• Jun Kaname
• Mitsuki Tanimura
• Eisaku Yoshida
• Hisahiro Ogura
• Yasufumi Terawaki