Very clichรฉ and uninspired. While tropes and clichรฉs aren't necessarily a bad thing, this film does nothing to stand out amongst the rest in its genre. The action scenes are the best part about this film, but even those are pretty mid. The characters where bland and we weren't given any real reason to care about anyone, even the main character. The flashbacks don't carry any weight because we don't spend enough time with those characters at all to really care about them nor do they add any information that is relevant to the plot.
*Spoiler warning*
I don't understand the motivations of the bad guys. I get that they wanted to take control of the city after Sakata killed previous yakuza group in control at the beginning. However, I don't know why they went after him in the first place after that. Sakata wanted to retire for the sake of his family and there weren't any hints that he was lying about that. I guess you could argue that they just wanted be sure that he couldn't go after them in the future, but then why let him live at all? They new that the bullet hadn't killed him but decided to let him live anyway instead of just sticking to the original plan of staging everything as a murder suicide. For a group that was hyped up to be this all powerful shadow organization that runs the city ruthlessly, they aren't very good at the most basic rules of organized crime.
What is all the talk about demons? I think this is supposed to be a metaphor, but the main antagonist talks and acts as if it's a real legend. He spouts this nonsense at the beginning, and sets it up as if this possession that happens every 50 years is the reason they go after Sakata in the first place. Maybe its how it is translated, but it feels out of place every time the demon thing is brought up. It would make more sense if Sakata was compared to a demon or it was his nickname due to Sakata's skills as an assassin, but that's not the case.