It's the Kantou prefecture swimming tournament. and the Umisho swim club is there. After doing poorly in the preliminaries due to a bet, the girl's team pours things on in the middle. In the relay race, the team discovers another team is cheating when they use a song to help the swimmer along. To mess this up, Masa, Amuro and some of the others sing their own song. Masa parading around and unintentionally flashing the singers of the other team cause them to mess up. Unfortunately, in the final lap of the medley, Momoko pulls a muscle in her leg, causing her to miss the rest of the tournament.
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