Ushio and Tora S01 E11 Mirror of a Single Strike

"Some families have skeletons in their closets... you won't believe what this family has in their basement!"

Ushio is staying at the Kamaitachis' house when he sees Asako calling out Mayuko with a face full of fright. After asking a mirror elder, he comes to know that a mirror demon has kidnapped Mayuko inside the mirror.