System Universe, by SunriseCV

A world-hopping LitRPG series starting on Earth a few years post System-Integration. But the adventure doesn’t stop there.

Its overpowered protagonist will quickly find himself on a new world, with a new System, providing a unique combination of the Isekai, LitRPG Apocalypse, and Slice of Life genres. He may even make a few friends along the way.