A high-schooler named Kimihiro Watanuki struggles with monsters and spirits that are magically drawn to him, but nobody else can see them except him. One day, Watanuki stumbles into a shop that grants wishes, where he encounters Yuko Ichihara—an enchanting witch seemingly all-knowing. Yuko quickly realizes Watanuki's hard work ethic and offers to grant his wish: not being able to see those bothersome monsters and spirits any longer. However, there is a price. Yuko notices that Watanuki would be useful for housework and other chores she wishes him to do until he works off enough power to pay for the spell's cost.
Watanuki, plagued by dark spirits since childhood, encounters Yuko, an enigma...