Kyosuke (Masaomi Kondo) and his sister Nobuko (Yoko Moriguchi) were invited to the 10th anniversary party of the travel agency "Pigeon". At that seat, Ayako, the younger sister of President Gentaro, is shot dead. Other venues included Gentaro's brother-in-law, Palau branch manager Kiriyama, secretary manager Anna, and Miyo, who runs a restaurant on Palau Island. A few days later, Nobuko goes on a trip to Palau. She is kidnapped by someone in the field, and Kyosuke and other related parties rush ...