Exorcisms Tonight? No, We're Closed

Why not open a shop? The kind that serves humans by day and comforts monsters late at night? And share it with a mysterious black cat who has cultivated in his true form for hundreds of years: all bark and no bite, sharp-tongued and picky, but fiercely protective in everything he does... In human form, he has black hair, green eyes, and cat ears and a tail he can’t control.