 If you liked
Monster Musume no Iru Nichijou
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 ...then you might like
Gensen Tanpenshuu: Gougasha
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(As Gensen Tanpenshuu is a collection of various stories, this recommendation is for the Silene-chan part.)
Daily life of guy in which a monster girl is romantically interested in. Comedy ensues, partially stemming from anatomical difference between humans and said monster girl. Both are seinen with ecchi elements.