A brief description of the manga Yakuza Reincarnation:
Our hero, named Nagamasa Ryumatsu, lived for many years in the underworld of the Yakuza gangs.
One day he falls into a deadly trap, but life gives him a second chance. At the moment of death, the hero is reborn in another world … But what is it ?! Is he a princess now ?!
Although outwardly our hero has turned into a sweet, beautiful girl, a demon still lives in his soul, who grew up among the underworld without morality and justice!