The Morose Mononokean

When Ashiya and Abeno see Zenko at school again, she asks them for help with a particular yokai. Zenko was bitten by a strange dog-like animal a few days prior. However, ordinary people can't see the bite mark, and Zenko, who was previously unable to see yokai, has begun seeing strange things. While listening to her story, a fox yokai suddenly appears behind Ashiya and Abeno. The yokai appears to recognize Abeno, but Abeno doesn't recognize him at all...