Fifty years ago, an experiment to extend life tore through the fabric of reality, opening portals that brought elves, kitsunes, and other races into the world. This event became known as the Zero Fragment.
Today, the city of Neo lives under the dictatorship of Nix, a young and ruthless empress. Freedom has become a memory. Non-human races are trafficked in the shadows of the regime.
Amid this dictatorship, Sirius lives as an ordinary citizen—but at night, he becomes Kronos, a lethal vigilante who fights tyranny with superhuman abilities.