Fukigen na Mononokean - MangaDex

Ashiya has spent his first seven days of high school stuck in the infirmary because of a youkai attaching itself to him. He ends up asking the owner of a small tea room called the 'Mononokean' for help. This is a tale involving the very morose owner of the Mononokean guiding mononoke that happened to wander into this world go to the next world.

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Fukigen na Mononokean - MangaDex