 If you liked
Nil Admirari no Tenbin
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 ...then you might like
Bungou to Alchemist: Shinpan no Haguruma
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Both of these series revolve around combating the dangers of tainted books. In 'Nil Admirari no Tenbin' the tainted books are literal threats that cause their readers to self-immolate. In 'Bungou to Alchemist' the tainted books are ones at risk of being erased by changing their endings, and reincarnations of various famous Japanese authors must delve into the books to prevent this from happening.