Killer Instinct {Complex}

This world is a wasteland! What's even more sad is that I can't die, I can only live over and over again! In this filthy underground, I witnessed humanity. Greedy. Brutal. Bloody. Betray. Human ugliness and stupidity. And the massacre on that rainy night. I remember the first person I killed was my mother. I've gone crazy for someone who only loves me. I gave up everything, but she was also killed. I originally thought I would never go back, but I still went back. I slaughtered a city, and they all deserve to die! They call me Demon King, Shura, so what? This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.