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

Tanaka suddenly appears in front of Yoshiki, who is walking with "something" that took Hikaru's place.
What he told me was the story about Hikaru's true identity.
When the resolve of both people was tested, the true feelings each of them discovered were─.
Meanwhile, the "hole" connecting them to the other world continued to expand without waiting for the two to grow.
The place we went to investigate the "hole" was Ashidori, where Maki lived.

At the end of the book, there is a meeting with his friend Maki.
Special short stories are also included.