I just finished watching the OVA and I have to say that I wasn't overly impressed. The basic premise of the story had promise: either become immortal or a monster through eating mermaid flesh. What broke it for me were the characters. Or rather, the lack of characters. The only two that were halfway tolerable were Mana and the 'mother'. The rest were flat and dull in my opinion including the antagonist. The art style is pretty outdated even in my eyes with the static shots and the awkward pauses in conversations. The voice acting...again refer to above for my opinion. It could have beena great story (haven't seen Mermaid Forest I will admit so I don't know if that's any good), but it needed better characters to help carry the story, and better dialogue.