Karin, a precocious teenager, finds herself abandoned by her father in rural Japan. Living in a temple with her grandfather, she meets Anzu, a giant and notoriously lazy “ghost cat” tasked with caring for her. Distrustful of her new guardian, Karin sabotages Anzu’s odd jobs for the townspeople and befriends the eccentric spirits of the local forest. In an effort to win Karin over, Anzu accidentally makes a deal with the devil, and all hell breaks loose.