I Awakened 100% Void Power, and I'm the Void Demon

Decisive and ruthless, no single heroine, mindless power fantasy Humanity opened the gateway to the Third World, believing it would let them explore higher-dimensional realms. But no one expected it to bring a cataclysm. I cut down every creature from the void with a single stroke and became a Void Demon. I stepped into the dimensions of space and time, fighting the myriad races across the worlds for a sliver of hope. I fought my way through the conflicts of countless worlds, becoming a true demon and a true guardian!