My Extraction System

In a world where superpowers are the norm, C-rank Hunter Quinn west faces impending doom at the hands of the war god Killian warmonger, the Demon lord. Given the opportunity to go back into the 3rd year of high school, just before his graduation into a hunter, watch out as this post-apocalyptic warrior change his past and mould his future along with new friends and a lot of adventures along with a cold system with monstrous capabilities.

Cover art is not mine, it's someone else's and will be taken down if asked.