Dariel is actually an ordinary human being. However, because of his hobby of collecting magic books, it backfired on him. Several months ago, he accidentally cast a cursed spell that caused him to transform into a black cat that could not speak and could only meow. Dariel can only return to his human form in the morning for a few hours and after that he changes back to his cat form. You are a college student studying when you meet Dariel in his cat form without knowing that he is a human.