Brimir and Hulda are best friends who live on a small island on a beautiful blue planet where there are only children and no adults. Their planet is wild and at times dangerous, but everything is free and everyone their friend. One day a rocket ship piloted by a strange-looking adult named Gleesome Goodday crashes on the beach who promises to make life a hundred times more fun. In exchange for these wonderful things, Goodday asks only for a little bit of each child’s youth.