Does anyone know of some really good yakuza mamgas one that kindove follows the plot of th...

Beast & Feast!

I read it already sadly

this one maybe?

Usagi Otoko Tora Otoko

These are related mangas with brothers stories
http://www.mangago.me/read-manga/zettai_unmei_houteishiki/ Main story

http://www.mangago.me/read-manga/tsumasaki_ni_kiss/ sequel

http://www.mangago.me/read-manga/gravity_eyes/ Sequel

And some more
http://www.mangago.me/read-manga/koi_made_hyakurin/
http://www.mangago.me/read-manga/tight_rope/
http://www.mangago.me/read-manga/sugar_code/
http://www.mangago.me/read-manga/secret_connection/
http://www.mangago.me/read-manga/yondaime_ooyamato_tatsuyuki/
http://www.mangago.me/read-manga/ani_no_chuukoku/