Hōkagogakari

Kei Nimori, a sixth-grader, becomes suspicious one day when he sees his name and the words "after-school duty" on his classroom blackboard. Later that night, he hears a school bell ring and a call to go to after-school duty. He suddenly himself in a mysterious school along with six others, including his former friend Sei Ogata. They are tasked with "after-school duty" by documenting the school's so-called Unnamed Mysteries, which manifest as monsters that haunt the school each night between 12:12:12 AM and 4:44:44 AM.

Kei Nimori (二森 啓, Nimori Kei)

A student who is summoned one night to another dimension. Together with six others, he becomes one of the Hōkagogakari, a group aiming at investigating the monsters that roam Hōkago. He is a skilled artist and uses his drawing skills in investigating monsters.

Sei Ogata (緒方 惺, Ogata Sei)

A student who goes to the same school as Kei. He was previously Kei's best friend and the only one at school who appreciated Kei's art, but the two had drifted apart.

Maaya Kenjō (見上 真彩, Kenjō Maaya)

Iruma Seto (瀬戸 イルマ, Seto Iruma)

Ruki Kojima (小嶋 瑠希, Kojima Ruki)

Raku Dōjima (堂島 楽, Dōjima Raku)

Sensei (先生)

A student who is also nicknamed Tarō-san (太郎さん) and tasks the others with their "after-school duty" of documenting the Unnamed Mysteries.

Gakuto Coda had been developing the manga for over ten years, having been inspired by tropes such as the Seven School Mysteries in Japanese schools as well as his own life as an elementary school student. He wanted to use the Seven School Mysteries as a major theme, depicting them as being incomprehensible or horrific, in contrast to them often being depicted in a more light-hearted manner in other works. He wanted the characters to feel as if they were truly sent to another world and found themselves in an "alien" situation. Despite his reputation for writing horror works, he considered himself as more of a fairy tale writer and wanted to incorporate folklore elements as well.^[1]

The series is written by Gakuto Coda, who previously wrote the horror novel series Missing and Danshō no Grimm,^[2] and features illustrations by Potg. It is published by ASCII Media Works under their Dengeki Bunko imprint, with the first volume being released on January 10, 2024.^[3] Six volumes have been published as of December 10, 2025.^[4] A promotional video narrated by Akari Kito was released on August 12, 2024.^[5]

A manga adaptation illustrated by Meiji began serialization in Kadokawa Shoten's Comp Ace magazine on July 26, 2024.^[10] The first tankōbon volume was released on February 26, 2025;^[11][12] two volumes have been released as of September 24, 2025.^[13]