 If you liked
Hana to Akuma
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 ...then you might like
Kainushi wa Akuma
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If you liked the handsome devils in Hana to Akuma try Kainushi wa Akuma - it a bit more grown up than Hana to Akuma, but also has the theme of a girl who is the companion of a demon. The devils in both are not evil - and both are quite humorous to read with very nice art and good characters.