A lonely teenager with the rare gift of seeing spirits inherits his late grandmother's mysterious Book of Friends, a record of youkai she once bound to her will. Determined to return their names and honor her memory, he navigates a quietly supernatural rural Japan alongside a gruff but protective spirit disguised as a chubby cat. This gentle, introspective series is a favorite among fans drawn to the folklore-rich atmosphere of Japan's countryside and the small, human moments tucked between its spirit encounters.