Spike's life was rough to begin with. He lives with a single mother, and neither of them know what happened to his father. One day during a walk in the forest, Spike comes across a strange capsule machine in front of a giant tree. He hears a voice telling him to put a coin in the machine, and against his better judgement, he does. He releases a strange spirit known as a Yo-kai named Whisper. He is given a watch called the Yo-kai Watch, which lets him see the mysterious spirits known as Yo-Kai. He soon finds out he's not the only one with a Yo-kai Watch, and that there's a secret organization called Y.U.C.S, also known as the Yo-kai Undercover Combat Squad. They work together to stop Yo-Kai from causing too much chaos. But little do they know that in the Yo-Kai world, an evil Yo-Kai is plotting against them. Along with stopping this evil Yo-Kai, Spike is also on a mission to find his missing father.