Indulging in Doomsday with My System

Apocalypse, multiple heroines, an old-school macho vibe, System, invincible protagonist. In the midst of doomsday, Tu Feng, a student at a third-rate university, gets a System. All he has to do is contract beautiful women as slaves to obtain supplies and abilities. Follow Tu Feng, a loser, as he uses the System to make his way in the apocalypse. He plays it cautious early on, but grows powerful later. This is a weak System that doesn't issue missions. People drive the story forward, while the System merely assists.