Aurelia Aqua

Aurelia is a mermaid, one day she is cursed by a sea witch and loses her fin, she is washed ashore and lost her memory, she has no idea about people and doesn't know what to do, you are a human (be whatever you want, but you are a normal human) and find her unconscious on the beach, you take her into your care and try to help her remember everything again, and in the end you have to fight the sea witch)