(This is an index for the Yokai that has appeared/has been used throughout the book which readers can look through after reading. Please don't read this chapter until you've read the latest chapter.)
Shinigami - The grim reaper equivalent of Japanese culture. Their duty is guide the departed to the other world.
Tengu - A half-human, half-bird type of Yokai.
Tsukumogami - A type of Yokai. They are tools or objects that inherit a spirit after a hundred years of service.
Chochin-Obake - A tsukumogami. They are paper lanterns that rarely causes harm to humans. They simply surprise and scare humans, laughing and rolling its large tongue and big eyes at the humans.
Nekomata - A cat Yokai that has two tails. They look like normal cats, but they can talk human language and can walk on two legs.