Jin’s class is sent on a trip to Seton’s Sea Academy. Shiraumi Kana, a Beluga whale-girl, fails to put on an impressive welcome show and flees. Ranka and Mei Mei learn Kana wants to join the schools' idols, a pod of dolphin-girls. Bando Ruka, the dolphin’s leader, denied Kana entry to the swimming club as Belugas are slower than dolphins. Jin tells Kana to form a singing show, as Belugas are excellent vocalists. Unfortunately, Kana is a terrible singer. Jin is approached by Ruka who, due to the dolphin’s unusual sleep patterns, alternately begs tearfully then forcefully demands Jin convince Kana to quit as a mixed species show is impossible...