The Apocalypse Hit, and I’m Still Working Overtime, Tightening Screws

Slaying Ten Thousand Enemies with a Broken Body, Fighting an Entire World Alone: The Broken Body Is the Tearjerker

Apocalypse, Disasters, and Looting Everything for Free: No Teams

I don't want stories where the protagonist starts out with tens of billions. I want them to be broke, doing zero-cost shopping sprees.

A Level Nine Civilization Invades, and I Alone Defend China's Gates!!!!!

Looking for books like "The Beginning: Returning to Earth from Level Nine Civilization". It’s so damn awesome!