Ouroboros - Vol. 1 Ch. 1 - Ryou the Dragon

[MangaDex]

 

[Basic_human]

I see, the gang man tips off the police with info and they finished the rest with law. Neatly and slowly gaining influence

The gang honcho credited as destroying rival gang and the policeman credited as the one destroying gang.

Combing their way through the criminal syndicate

 

[Siquall]

Time to reread this one.

I stopped near the end, want to see it now.