What's this anime movie call?

I don't remember the title of this japanese anime movie and it's pretty old. It's a about a mermaid who ran away from her demon fish master and she meets a human who saves her. She wakes up and bites hims in the arm( it could have been the leg I don't remember). She's skeptical about him at first then she and the human are fond of each other. Then the demon fish wages a war against the humans. The demon fish gets injured and the mermaid leaves the human and returns to her master. That's as far as I remember. Well that's a least how it goes, somewhere along the line. LOL

Update:

yes, I'm sure it's not the little mermaid. It's more of a spin off.

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