Angels and sirens. The rivalry between the two has been going on for generations. Talya is an angel, but every angel is different. Talya loves the ocean even though she has the gift of flight. One day, after flying after a pair of curious eyes, she fell from the sky and found herself in the underwater city Daryalani. Daryalani is the ocean's capital where most sirens live. So what is an angel going to do underwater?

Kisa Anima and Corno Pratt are a different species from humans. They are something called "Saturnos."