14-year-old Sunaoko travels from Tokyo to Naha, Okinawa, with her father’s young fiancée Momoko in search of her half-brother whom she has never met. Their guide, a beer-guzzling ex-soldier, takes them to the locale’s tourist attractions, quickly delving into the underlying scars of the island’s wartime history.

The film is set in Karafuto after the radio broadcast of the Imperial Rescript on the Termination of the War. On August 15, 1945, Soviet forces invaded Karafuto. On August 20, the postal telegraph office in Maoka suspended operations and nine of the twelve telephone operators committed suicide by taking potassium cyanide while the city was being invaded.

After World War II, when Okinawa was under control of the United States, the local yakuza prospered. But when Okinawa is returned to Japan, the mainland yakuza tries to take over; the local yakuza tries to compete. Now sides are drawn among the local yakuza guys who used to be best friends since their childhood, and brother fights brother. It results in the biggest yakuza war in Okinawa.