Nate is a just a regular boy struggling to be above average at school. One day he gets the chance to see and communicate with the mischievous Yo-kai. With the watch on his wrist, Nate starts to form friendships with them and learn of the things that make life so complicated. There's just one problem: they're everywhere and they love to cause mischief!

Deep within the Forest of Okoya, the Mythical PokÌmon Zarude live in a troop and maintain a strict rule that forbids outsiders from entering their territory. Elsewhere in the jungle lives Koko, a human boy raised by a lone Zarude who left the troop. Koko has grown up never doubting that he is a Zarude. But one day, a chance meeting with Ash and Pikachu leaves Koko with his first human friend. Is he truly a PokÌmon? Or is he, in fact, a human? When...