 If you liked
Takahashi Rumiko Gekijou Ningyo no Mori
|
 ...then you might like
Fullmetal Alchemist: Brotherhood
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To me, they are similar if we're talking about immortality. They are similar yet different. Mermaid Forest focus on immortal ones who wants to be normal again. But FMA Brotherhood focus on normal beings who want immortality.
Desperately finding a way to each road they take.