 If you liked
Hamelin no Violin Hiki
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 ...then you might like
OZ
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Both borrow theming elements from old stories (The Wizard of Oz for Oz and The Pied Piper of Hamelin for Hamelin) in an endearing way yet are completely different from their source materials, instead telling their own story. Both also star a redhead with pigtails and lots of blondes, have romance elements, and have overall pretty dark colour palettes.