There used to be a boy who could control Yo-kai with a mysterious watch. However, he became unable to see Yo-kai when he became an adult. With the boy's duties finished, the watch was buried away ...

when the Yo-Kai Watch was first invented by Nate's grandfather, Nathaniel Adams, while he was a boy. Together, the 2 boys fight Dame Dedtime and her evil Wicked Yo-Kai minions to save the world ...