In Japan, Inoha's quiet routine is interrupted when she encounters USApyon, a space-traveling Yo-Kai who has ended up far from home. The two form an unlikely partnership and establish a detective agency, solving cases that draw on both Inoha's wits and USApyon's extraterrestrial capabilities. Across the Pacific, Keita has relocated to the USA following his father's work transfer, beginning his own separate chapter of the Yo-Kai Watch story.