It follows the story of Yoshiki, a teenager in rural Japan who discovers that his best friend Hikaru has been possessed by an otherworldly entity, forcing him to navigate their changed relationship amid supernatural dangers.

Yoshiki and Hikaru are two teenage boys living in a small town in rural Japan.

This "Hikaru" has all the feelings and memories of the original, yet remains a separate being, something Yoshiki realizes rather quickly.

After graduating, Mokumokuren began posting drawings on Twitter in their spare time in January 2021.

[7] While writing the story, Mokumokuren tries to keep the horror to a minimum by trying to appeal to people's emotions rather than just being scary.

[7] For the artwork, Mokumokuren tries to use onomatopoeia that are not often used, while also staying cautious to make sure it works properly in the context of the story.

[9] Mokumokuren used their grandmother's hometown as model, where the houses were all packed together tightly and normal for the neighbors to come and go without permission.

[10] Written and illustrated by Mokumokuren, the series began serialization on Kadokawa Shoten's Young Ace Up website on August 31, 2021.

[13] A novelization of the manga series, written by Mio Nukaga, was published by Kadokawa Shoten on December 4, 2023.

[24] At New York Comic Con 2024, Yen Press announced that they also licensed the novel for English publication.

[26] It was later revealed to be a television series produced by CygamesPictures and directed and written by Ryōhei Takeshita, with character designs and chief animation direction handled by Yuichi Takahashi, and "Dorodoro" animation handled by Masanobu Hiraoka.