Duke is the secret god of his island home, and he loves surfing on his magic Koa wood board more than anything. But the powerful Sea Hag curses him and shrinks his board. To get it back, he has to stay married to Kai, the Sea Hag's human daughter, for 5 years. Duke helps Kai rise to stardom as a surfer, but Kai thinks Duke is just a worthless house husband. She mistreats him, and falls back in with her ex-boyfriend, a world famous surfer. When the five years are up and the curse is lifted, Duke must choose – stay with Kai and hope she recognizes his worth or divorce her and live life on his own terms?