Yakuza Reincarnation Vol. 2 (manga)

YA GOTTA PROTECT YOUR TURF

The yakuza Ryu has gotten a handle on his new life as this fantasy world's princess. He's bashed in some heads, survived a hit attempt, and saved a city ravaged by a drug called Witchin. The corrupt knight responsible is at Ryu's mercy and might prove useful.

This is all the calm before the storm. A minion of the Dark Lord arrives to wreck the town! And even worse, law enforcement!