A monkey too proud to admit he can't swim gets dragged to the bottom of a pool, fights a kappa for his life, and accidentally makes a friend out of it. The whole thing moves with the kind of cheerful chaos that doesn't care if you understand the logic, only that you're watching. By the time a water demon is giving swimming lessons to a drowning primate, you've already stopped asking questions and started laughing.
A swimming competition draws animals from all around, and Saru-kun the monkey refuses to let his complete lack of swimming ability stop him from competing. Pride overrides sense, and he launches himself into the pool only to plummet straight to the bottom. What he finds down there is far stranger than expected: a underwater landscape dense with seaweed and coral, and a kappa who guards his domain jealously. The two clash immediately, with Saru-kun managing to snatch the mythical creature's prized saucer before things escalate further. Rather than continue fighting, the kappa proposes a bargain. He'll carry Saru-kun through the water on his back if the monkey returns his precious saucer. It's a deal that lets Saru-kun cross the finish line while appearing to swim under his own strength, winning the race outright. But victories built on deception rarely come without cost, and fate has one final twist waiting at the pool's edge. This short film blends slapstick comedy with Japanese folklore, creating something wildly inventive that appeals to anyone who enjoys clever, absurdist humor grounded in whimsy.