The world of Double Hard is one of turf warfare. Rival gangs, often on motorcycle, fight it out in the streets to secure territory. Sunglasses, leather jackets, big hair, and face scars abound. Rank seemingly determined by how big your chin is.
It's a series where thugs intimidate people in dark alleyways. Where lackeys express concern to their gang leader, only to receive a beat down for not having total faith in their boss. Where everyone is cocky to a fault. There's also a lot of knife licking.
Perhaps an image has formed in your mind and you know exactly what this series is. You've likely watched
something like it before, as it's not really anything new. But it is also based on a manga from 1994, so it's really not anything new.
That said, I found it thoroughly enjoyable. The art style is very reminiscent of old fighting games, say Tekken or Virtua Fighter. Which is really the whole vibe of the show. If you've played those games and seen their cutscenes, Double Hard is like that. As someone who enjoys those contrived fighting game storylines and the goofy pre-rendered cutscenes that come with them, I found Double Hard to be an enjoyably nostalgic "popcorn flick" experience.