Stories where yakuza or thugs fall in love can be any genre.
Maybe you can find something from this list of BL yakuzas http://www.mangago.me/home/mangalist/787423/
http://www.mangago.me/read-manga/raise_wa_tanin_ga_ii/
seriously love this one but its yet to progress to love
Yall the raws looks crazy asf....( ̄∇ ̄")
no cap bruh. that top is a freak (derogatory)