The school I go to is a quiet school with a little forest behind it.
I like such a school with a beautiful light blue and white school building ... but now I can't get in touch with my classmates anymore ...
My class now is "Blue Class".
It is a class that gathers children who have died at school but have not been found or have not been offered a memorial service.
… Classes are fun, but everyone feels lonely….

In addition to the title work, "Karon" is a story about a cat trying to protect the owner's family from invisible and terrifying things.
The identity of the girl who once played under the tree is ... "Jubokko".
A "reincarnated mermaid" that depicts the end of a man who sought a lot of "mermaids" in her own image.
The man who talked to me at the library, the book he gave me ... "His book".
Iku Oyamada's first horror work collection that includes the horror figure "I was in the city" reflected in the mirror of the house in the new town!

Oyamada-sensei's book comment at that time
"I wanted to draw it in horror magazine because it's okay to do it once, but before I knew it, I drew it so much that it became a comic. My first horror collection of short stories has become almost fantasy, but it seems to be one of my favorite books. 』\