God created nine races in ancient times. Humans were the weakest and most ridiculed race among them. Light, a human boy, was fortunate enough to be invited to join a gathering of all nine races called "The Assembly of Races." He was happy to be a member for a while, but it was a short-lived dream. His hopes were betrayed by his fellow members in the largest and most dreadful dungeon, "Abyss." After surviving alone in the depths of the Abyss, Light learns the true meaning of his gift "Unlimited Gacha." Light will rise from the deepest despair to build his own empire of the strongest players.