 If you liked
Saezuru Tori wa Habatakanai
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 ...then you might like
Caste Heaven
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When I think of Caste Heaven I think of a "darker" themed yaoi manga and thus I recommend Saezuru. Mafia trope but the main character is the "cum dumpster" of the series and goes through a lot of psychological and philosophical processes whilst the other protagonist is impotent, yet in love with said character. I just think it's a really well put together manga that deserves everyone's attention and I put it on the same level as Caste Heaven.