The gate to the other world is open, and it appears to be some kind of tropical paradise. Tetsuro frolics in the waves with Gentai and two other young girls. Kano suns herself on the beach, and the Koi Koi 7 play in the sand. Izuma and Subaru rub each other with suntan lotion. Offshore a sinister submarine lurks: Gokō 5 is at it again, but beats a strategic retreat when Otome gets wet. When Otome's unconscious body is beamed up by a UFO, everyone goes off in pursuit, but they are distracted by the discovery of an onsen, where the decisive battle ultimately takes place.