Playing as fishermen in the playroom, the Princess and the Prince try to catch plastic fish from a bucket. They're soon in a fantasy world on the bank of a magical river, competing to see who's the better angler. They vie over who has the fancier fishing rod and who can cast the line further. In the end, as they try to catch as many plastic fish as possible and almost land a toy whale, it escapes at the last second, and they're left empty-handed. Enter Bona, who manages to catch the toy whale, earning the title of the world's best fisher-dog, to the delight of the reconciled siblings!