A new female trainer, Iida, arrives at the Irie Aquarium, and soon proves to be a formidable rival for Ginji's affections! The competition between Iida and Minako reaches soggy new lows during a pool party contest to win a trip to the South Pole, home to numerous species of Gin-chan's brothers-in-wings. Iida's nefarious plan involves a girl in a paper bikini and osmosis...you do the math!