A boy who grew up together in a certain village,
Yoshiki and Hikaru.

After "something" took Hikaru's place,
Negativity began to spread throughout the land.
To prevent the spread of negativity
Yoshiki moves to close the many "holes" that connect him to the other world.
A "hole" that can only be closed from the opposite side.
Hikaru uses his "connection" with Yoshiki, who did not turn his eyes away from "something".
He suggests that he close the "hole" and come back.
Meanwhile, Asako and Tanaka are trying to get the "hole" closed.
When dealing with negativity─.

At the end of the book, Asako asks Tanaka about the "rat".
Special short stories are also included.