Undine is a young, blue-haired girl who lives in a lighthouse and has two inseparable companions: her dog Trout and her best friend Kukuma. On the day of his 11th birthday, Kukuma receives a small boat as a gift. When fate leaves Udine and Kukuma adrift at sea, they'll undertake a long and surprising voyage back home. This is a fanciful and imaginative tale replete with adventure and friendship.