is a Japanese light novel series written by Toowa and illustrated by Huuka Kazabana. It was originally posted as a web novel on the online publication platform Shà Âsetsuka ni Narà  in April 2017, before Fujimi Shobo began publishing it as a light novel under their Kadokawa Books imprint in November of the same year; nine volumes have been released as of September 2025. A manga adaptation illustrated by Rikizo began serialization Kadokawa Corporation's ComicWalker service in March 2018. Ten volumes have been released as of January 2026. An anime television series adaptation produced by Maho Film is set to premiere in July 2026.
The series follows Arihito Atobe, a salaryman who is killed in a bus accident. After being reincarnated into another world, he is asked to pick a job class. He picks being a rearguard, which turns out to be a powerful class that no one before him had been before. Aimed with his new powers, he help his party members explore labyrinth, as their bonds grow over time.
Toowa originally posted the series as a web novel on the online platform Shà Âsetsuka ni Narà  on April 27, 2017. It was later picked up for publication by Fujimi Shobo, which started releasing it as a light novel under their Kadokawa Books imprint. The first volume was released on November 10, 2017; nine volumes have been released as of September 2025. The series is licensed in English by Yen Press.
A manga adaptation illustrated by Rikizo began serialization on Kadokawa Corporation's ComicWalker service on March 30, 2018. The first volume was released on September 22, 2018; ten volumes have been released as of January 2026. The manga adaptation is also licensed in English by Yen Press.
An anime television series adaptation was announced on September 8, 2025. The series will be produced by Maho Film and directed by Yà «ji Yanase, with Deko Akao handling series composition, Eiko Yanagimoto designing the characters, and Hinako Tsubakiyama and Fuwari composing the music. It is set to premiere in July 2026 on Tokyo MX and other channels. Muse Communication licensed the series in South and Southeast Asia.