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In the near future, a nuclear war that spreads around the world will completely destroy the old society of mankind. Time passes, and on the ruins of the old society, a new giant city quietly rises, a concrete jungle called "New Heaven". And in this fallen city, a ruthless avenger strokes her blade, stalking her prey in the neon shadows.

Five thousand years ago, the world was about to be swallowed by the darkness called the Abyss. The ancient heroes burned their lives to seal the abyss. Now, five thousand years later, the shackles of the abyss have rusted away, and supreme darkness is about to envelope the world again. But this time, an imperial recruit named Wyatt was accidentally involved in the battle that determined the fate of the world. And in this thrilling journey, he will discover the secrets hidden under the world, as well as the truth about the final battle five thousand years ago...