A fern spore catastrophe erupts on the Lost Continent, unleashing mutated zombies that ravage the land. Mercenary Kyle, bitten by a zombie during a shipwreck, instead of mutating, awakens the bloodline of the ancient Abyss race, acquiring special antibodies and teaming up with scientist Elena to survive. Together, they investigate the root of the catastrophe, uncovering ancient secrets of the Abyss civilization's spore experiments going out of control. The obsessive scientist Aldrick, driven by his personal motives, pushes the spores to spread across the entire continent. In a desperate situation, Elena sacrifices herself as Kyle's blood key, activating the altar to purify the calamity and end the catastrophe. The survivors return to the civilized world with the antibody data, establishing a research center in her name, while Kyle continues his journey, carrying with him his memories.
