[a], also known as Ranger Reject, is a Japanese manga series written and illustrated by Negi Haruba.

It has been serialized in Kodansha's Weekly Shōnen Magazine since February 2021, with its chapters collected in seventeen tankōbon volumes as of January 2025[update].

An anime television series adaptation produced by Yostar Pictures aired from April to June 2024.

Tired of the charade, and realizing that this amounts to little more than slavery, one of the foot soldiers rebels and decides he will defeat the Dragon Keepers by infiltrating the organization.

The "Colorless" refer to the lowest-ranking members of the Keeper hierarchy, and are often looked down upon by those higher up the ranks.

On October 27, 2020, Negi Haruba started recruiting regular assistants for his coming new series.

[13] The manga series began its serialization in Kodansha's Weekly Shōnen Magazine in the 10th issue published on February 3, 2021.

[16] In November 2021, during their panel at Anime NYC, Kodansha USA announced their license to the series and would release it in both print and digital.

[47] It was produced by Yostar Pictures and directed by Keiichi Sato, with scripts written by Keiichirō Ōchi, and character designs handled by Kahoko Koseki, with Kenji Hayama serving as animation supervisor.