User blog comment:Viperys/Konosuba Crack Theory (careful, spoilers)/@comment-28057182-20161111204034

I got a responce on that:

Eris isn't the angel that replaces Aqua. Aqua was watching over Japan and handled dead japanese teens. Eris is responsible for Fantasy Straya. Aqua was sending japanese teens over to Eris' domain for years. Inventor-kun was transferred around the time games like Pacman and Galaga were out.

Was Aqua shit at her job? Yes. Eris is also shit at her job but at least she has an excuse that Fantasy Straya is a shithole to begin with and when she asked Aqua for help she made it even worse/