 If you liked
Ningyo Series
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 ...then you might like
School Ningyo
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Both are based on the idea of eating a mermaid's flesh to benefit from its supernatural powers -- in Mermaid Saga to obtain immortality, and in School Ningyo to win the favour of a crush. Although both are horror, both scare more with the overall creepy tone of the works and dark themes rather than overtly frightening imagery, although that does turn up in both as well.
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Recommended by lithiumflower