Dyesebel (2014)

Young mermaid Dyesebel journeys to trace her origins until she finds out that she is the daughter of a merman and a human. Disowned by the sea for being the child of Tino, who was the prince of the sea, and the human Lucia, she explores the human world where she meets Fredo. But she realizes that she isn't accepted by both worlds. And as a war between man and the underworld appears imminent, will Dyesebel choose to leave her loved ones?