Demons Battle (The unexpected 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. The internal conflict is one he has to live with for the rest of his life but one fateful day is forced to answer when he comes home. But Demons Battle called him not in the way he wanted.