Nagisa is a young girl who lives her summer holidays when she turns from a child into a teen-age girl at the beginning of the 70s. Her biggest wish is to buy a new record player. She is ready to do small jobs to get some money. But she always finds some time for a nice swim. That is how she meets a boy who collects shells, but cannot swim. Nagisa will teach him to swim, writing his destiny unintentionally.
