Mizukami launched a manga series published in Shōnen Gahōsha's Young King OURs from April 2018 to July 2022.

Sōya Kuroi lives with a large cat-like creature called Sensei and a happy maid named Ginko.

Sōya finds himself pressed into battle, fighting not against the beasts, but against the seven heroes instead, as he becomes an unwitting pawn in an interstellar war that has come to Earth.

Shōnen Gahōsha first hinted at the project on November 30, 2017, when they announced that Satoshi Mizukami would be writing a new "large-scale" science fiction series in April after his current manga finished serialization.

Mizukami had begun work on the series four years prior, and has drawn 1,074 pages of storyboards for the project, in addition to writing both the manga and the anime.