I'll tell you exactly what this makes me think of:
A side-scrolling action video game like Dust: An Elysian Tail, except with a modern, urban, anime-influenced aesthetic instead of fantasy themes.
The environment has cars, skyscrapers, condos, construction girders and platforms, and a dark, bleak, reddish sky. Super Smash Bros. Ultimate has a Persona 5 stage sort of like this.
The main character you play as in this supposed game has just met with a recurring rival, who challenges you to a fight, during which this music plays.
That is what I think of.
Now, keep in mind I know nothing about your characters or what they represent. It's hard to tell as it is what you are going for, what aspects of Law's personality are, what Law's visual appearance is, and what other aspects make up that character. I can't judge how well this theme fits the character, Law, without seeing or knowing anything about them, which is the only reason I give this 4 stars.
Know that if I were just rating it on how much I liked it, I'd have a different, probably higher, rating.
I hope this helps. :)
More info about how I review music here: https://codefreq.newgrounds.com/news/post/1089806