Alberto is a 16-year-old fisherboy, the villagers call him a sea monster hunter because of his despise of those creatures for killing his father, he will hunt them for revenge. Luca on the other hand is a sea monster who keeps wondering above the surface. His parents told him to not go near the land because the land monster is a threat to them. Luca won't listen and decided to check for his own.
There he met Alberto and be friends with him after he found out he is a sea monster hunter, he decided to hide his true identity.