There are two merkingdoms that have been at war for centuries: the trade-heavy Coral Reef and the transport-based hub of Atlantia. To resolve this conflict, the Elders of each kingdom have decided to unite their lands by marriage – of the Stingray Princess Manta to the first son of Coral Reef’s Elder; Prince Flowerhorn. The two have been best friends since they were little fishlets, however, they are not in love. In fact, Princess Manta has been crushing on her chambermaid, Grey. On the other hand, with dreams of becoming the best undersea chef there ever was, Prince Flowerhorn isn’t ready to be married so soon and give up his fantasies of owning a land vs. sea-fusion restaurant. He's already planning to run away with the staff of chefs from his royal kitchen, who have promised to help him realise this dream. However, Elder Octo, his father, is not having any of this, constantly cautioning his son about the responsibilities to his kingdom.
Coral Reef looks like - well - a coral reef, with sprawling beds of multicolored coral, seaweed and low-lying buildings fashioned into anemone and sea caves within rock. Atlantia on the other hand lies in the big blue sea far from shore, and is comprised of tall bronze buildings swirling up to an central spire of the palace in the centre of the city. The Merfolk in Atlantia are based on deep sea or solitary marine life, while people in Coral Reef tend to resemble reef-like tropical fish.