Don't Mess with The Yakuza! ~ Broken in by a Crime Syndicate Deputy Leader
Ongoing | Nakaochi | 2022 released
The Time a Gangster was Reincarnated as Ranmaru Mori
Ongoing | | 2000 released
chapter 20 - wait till it reaches chapter 30 to read yakuza travels to real historicalpast, only to return to a different modern/present day, after being shot in the historical timeline by the same subordinate from his real life.
Kozure Omega to Boukun Yakuza