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Ghosts originated during the Warring States Period. Later, a samurai with superb swordsmanship drove him away, causing trouble for many years. At this point, I must kill the ghosts.

Suddenly attacked by biochemical ghosts of unknown origin, the powerful biochemical ghosts made the people tremble in the apocalypse, and human society became precarious... The biochemical ghosts roared and killed humans with thunderous momentum, occupying human cities, leaving humans without the ability to resist.