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With the help of the "Dragon Sin of Wrath" Meliodas and the worst rebels in history, the Seven Deadly Sins, the "Holy War", in which four races, including Humans, Goddesses, Fairies and Giants fought against the Demons, is finally over. At the cost of the "Lion Sin of Pride" Escanor's life, the Demon King was defeated and the world regained peace. After that, each of the Sins take their own path.
Dr. Emma Collins and her team are spending their third summer on the island of Little Happy studying the effect of climate change on the great white sharks who come to the nearby nursery every year to give birth. Along with the last two inhabitants of this former fishing village, their peaceful life is disrupted when a "scientific" team led by her ex-boyfriend and marine biologist Richard show up looking for three bull sharks who we soon learn aren't just any bull sharks.