I Grow Stronger by Taking Beatings in the Apocalypse

This world is filled with radiation that can mutate or kill people. Humanity can only huddle inside cities protected by walls, while our protagonist has a special constitution despite frequently having to leave the city and expose himself to radiation.

"What? Everyone else can only stay outside for a few hours, but I've been out here for days without a problem. I'm even feeling more energetic!"

"What? When other people get hurt, they need a doctor. I don't, and I actually get stronger!"

Welcome to this wasteland world. Join our protagonist as he explores all kinds of strange new things and grows stronger!

This novel and its characters are entirely fictional. Any resemblance to real people or events is purely coincidental. Do not imitate.