Marginal Operation Zenshi: Haruka Toudo no Canaan

[MangaDex]

 

[CyanHide]

I know there are no chapters here, but in what way does this look like a prequel?

 

[Nohd]

Not getting fantranslated anytime soon huh

 

[zetsuravez]

So anyone knows what is the connection between this and the marginal operation?..