In America, but the System Insists I'm in Warhammer

A crossover between My America, My Rules and I Don't Eat Beef Chen Mo transmigrated to New York City, becoming a Chinese-American college student saddled with enormous student loans. To avoid discrimination, he worked out like crazy, only to have a crooked personal trainer inject him with veterinary drugs. As he lay dying, the System suddenly activated. [Original human genes detected! Purity: 99.7%!] [You are the only Zhen Dan human of the Golden Age!] [Warning! Your world has been corrupted by Chaos! Large numbers of demons are disguised as humans!] The System insists this is the Warhammer 40K universe and demands that he purge the world. But to Chen Mo, a demon is just a personal trainer, and a succubus is just an ordinary blonde woman. The System, however, keeps issuing frantic warnings: [Danger! Lesser daemon of Nurgle!] [Warning! Succubus is using her seduction ability!] [Chaos stronghold detected! Immediate purge recommended!] Chen Mo: “So you really are mistaken, right?” System: [This System's findings are 100% accurate!] Whatever. I don't eat beef, anyway!