This movie tell a story that set in a small fishing village in Shikamachi, Ishikawa Prefecture. People in this village depend on the local amateur orchestra as their favorite source of entertainment. When the conductor dies unexpectedly, the townspeople recruit the man’s granddaughter, a high school student with a talent for conducting.
Set in the near future. Children who are contaminated by radiation poisoning face the fate of being cast into the sea. However, one boy manages to survive and drift to Hogi-Lala Island, where only children live.
Hayato, a boy in the 6th grade, hides the secret that he can't swim. Every summer, he pretends to be sick, so he could avoid school swimming tournaments. But, as it is the last year in the elementary school, he can't escape from swimming practice and is forced to participate.
