>>281446508
Furinkan also notes that: "Many of the story elements in Came the Mirror are similar to Gantz by Hiroya Oku, including death and resurrection, being chosen by an unseen organization to fight against supernatural forces, and extreme violence. Oku is a well known fan of Takahashi's manga and it appears the feeling may be mutual."

Is it even stated it is an organization? The child labor law line does hint at that, but it seems more complicated than that. Anyway, I haven't read Gantz so maybe this is not such a stretch, but those elements seem like it would be in a lot of stories.