My Own Demons System

Gabriel is the world’s biggest fan of DEMON BATTLE and not just the sport itself but a specific DEMON BATTLE fighter called KILLER JOE. What he dreams for is to become the best DEMON BATTLE fighter like his idol KILLER JOE. Unfortunately, what is he expected to accomplish in a sport only meant for people known as Powered Humans who possess unnatural superpowers as a regular human himself who writes under the shadow of his very powerful elder sister, Leah, who is a Powered Human. But all that changed when he found his idol 'Killer Joe' strangling his sister with his mom and little sister lying lifeless.