Kenkou Zenrakei Suieibu Umishou

This introduces the characters and the setting. On the beach, Momoko Orizuka and Kaname Okiura are relaxing when a houseboat comes in. On that houseboat is Amuro Ninagawa. She is holding a three-foot long shark in her hand. She comes in and offers the shark to Momoko. Momoko refuses, saying she doesn't like a dead shark. Amuro says the shark is still alive. It then springs to life in Amuro's hand and tries to bite Momoko, but ends up tearing Momoko's bikini top off.

Amuro is introduced to the swim team. Captain welcomes the newcomer by throwing a shaving party. Swim practice is show to be, at best, unproductive. On the way home that day, Amuro discovers a new local celebrity by accident.

The team attends the local swim competition and ends up in last place. The team captain can't concentrate on the swim meet that they're at because his father's restaurant is in financial trouble. To help his family out, Amuro and the other swim team girls spend a few days serving customers wearing only aprons and swimsuits. Naturally, this attracts a lot of men.

After the team's poor showing at the Tri-Meet, vice-captain Orizuka decides that what the team needs to succeed is teamwork, and a training camp is just the thing. Typically, the training itself starts out like just another practice with much goofing-off and little actual practice.

With their houseraft wrecked by the storm, Amuro and her father are invited by Kaname's parents to stay at their house until repairs can be made. While initially interested in having a girl living at his place, Kaname soon becomes infuriated at Amuro's lack of understanding about privacy and her total lack of modesty.

The Ninogawa houseraft reconstruction is proceeding smoothly. On the way to school, Amuro meets Maaya Nanako, a model and competitive swimmer. They are soon surrounded by a crowd which includes Kaname, who apparently was childhood friends with Maaya. She has transferred to Umishou and will be on the swim team.