The story follows Kai, an intersex seventeen-year-old in a world divided by gender, who has been hidden away from the world by his mother for most of his life until he is discovered and separated from his family. The only way he can get back to them is by uniting the men of Otec and convincing them to fight for the old world where all of humanity lived amongst each other but Kai soon finds out that some monsters are better left divided by oceans.