Kösaku and the Özora's end up stranded on a desert island. Hibari shares her fantasy about repopulating the world with her and Kösaku's children. Ibari gets angry and calls Hibari a boy, even though Kaji is nearby. They are joined on the island by Kawahana Hiroshi, who makes adventure television programmes, but he mistakes the Özora's for cavemen and runs away, only to be thrown into the river by the real island natives. Ibari has a heart attack when he realises the natives can speak Japanese. The chief's daughter, Ribahi, is identical to Hibari and Kösaku develops a crush on her. Ibari worries about Tsubame and Tsugimi and decides they must return to Japan...