不機嫌なモノノケ庵 (Series) favorite_border

Ashiya has been possed by a youkai, and for the first seven days of high school, he's gone straight to the infirmary. His only hope is the master of the 'Mononokean', a four-and-a-half mat teahouse. This is the first volume of mysterious stories of a morose master who saves youkai who have become lost in the human world for various reasons and guides them to the hidden underworld.

(Translator: Mizuki)