Reborn to Rule the Seas

Apocalypse floods world, marine life mutates to prey on humans. SS-Class Esper Yuri betrayed, killed by vice-captain Kane, reborn as Little Carp. Awakens Devour and Evolve System, obtains Kunpeng bloodline, evolves by devouring monsters. Saves female investigator Grace, reunites with teammate Morgan, to expose apocalyptic conspiracy. Evolves into SSS-Class Primordial Kunpeng, overlord of deep sea. When flood recedes, Yuri and companions rebuild human civilization, protect new world.