The story of Dyesebel begins when human Lucia (Garcia) delivers a beautiful yet unusual baby girl; unusual because, unlike normal babies, Lucia's child is born with fins for legs. The child is called "Dyesebel" (Rivera). And although surprised by their daughter's strange form, Lucia and her husband Tonio (Ramos) promise to love their child no matter what.

But in no time at all, their neighbors discover the couple's secret. And when the community is hit with a series of catastrophes, the town believes that the anomaly that is Dyesebel is to blame; an accusation that leads Lucia to offer her only daughter to the sea, where she would fit better.

Unknown to Lucia, it is at the heart of the sea that Dyesebel's adventures and misfortunes will begin, and it is within the confines of the waters that Dyesebel will lead a new life-a journey that would take her to the depths of the sea, as well as to chaos of the city.