The Morose Mononokean is an anime series that follows high school student Hanae Ashiya, who becomes ill after being possessed by a small yōkai. Seeking help, he contacts Haruitsuki Abeno, the owner of the Mononokean—a mystical tea room that serves as a portal to the Underworld. After Abeno exorcises the yōkai, Ashiya must work for him to repay the debt. Toge...