In the future, a disaster known as the Abyssal Mutation sweeps across the globe. Mysterious energy suddenly surges from the depths of the ocean, causing marine life to undergo horrifying mutations. Vast numbers of twisted monsters begin invading human territory. Humanity builds coastal defense cities and struggles to hold the monsters back through a combination of technology and people with supernatural abilities. Meanwhile, mysterious “spirit cores” begin appearing in the deep sea. They grant living creatures immense power and become the focus of a struggle between humans and monsters.
