If you liked
07-Ghost
|
...then you might like
Number
|
These two are incredibly similar in nature, the overall feeling is a reflection of both manga. The main character is the same, the scenario is basically the same, even the art is similar.
If you liked
Totally Captivated
|
...then you might like
Saezuru Tori wa Habatakanai
|
Both involve with Yakuza, both have a bit of psychology going on with mild dark pasts (TB, Saezuru definitely has dark pasts) and both are very interesting. Highly recommended.
If you liked
Saezuru Tori wa Habatakanai
|
...then you might like
Caste Heaven
|
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.
If you liked
Tokyo Babylon
|
...then you might like
Caste Heaven
|
While not as severe as most yaoi (it's technically shounen ai and even then, no actual kissing or genuine affection takes place), there is a lot of flirting and brutal pain to be had in this manga. The main character is Subaru who has a pure heart and cares deeply for everyone he meets while his pursuer is an Assassin who considers everyone else to be less than objects. I just think with how twisted the characters are (especially when it follows into X) and the darkness of the series contrasts well with Caste Heaven.