Kochi Uehara is a fourth grade student living in the suburb of Tokyo. One day he picks up a large stone which turns out to be a fossil of a baby "Kappa" (a mythical Japanese water creature)...
A writer moves to a remote island with his daughter and young son. After settling into their new home, a neighbor arrives to welcome them and give them a breakdown of the local rules; most important: do not go outside when the island's siren starts wailing.