 If you liked
Kemono no Souja Erin
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 ...then you might like
Made in Abyss
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The vibe in Made in Abyss is, so far, the closest thing I have seen to Erin (other than of course Mushishi, which does not share the child characters that these two do). Melancholic yet not without comedy, mysterious, and a determined female main who wishes to be like her mother, who she was orphaned from. The fantastical beasts are prevalent and integral to both stories.