When you explore the environment does it feel similar to exploring in Shenmue IYO? I've heard this game was heavily inspired by Shenmue.
Haven't played Shenmue so I can't say. This game wasn't really inspired by Shenmue THAT much, at least I don't see it. The series was clearly designed to be a beat em up (the series creator has a long history with beat em ups) with a dark and grueling story involving the criminal underground.
Let me describe a typical situation:
"I just finished a quest line and am outside a bar. I'm told to go to an office of an associate to advance the quest line.
I choose to divert and go off to the local bar with karaoke. On my way there, I get stopped by some goons. I beat the living shit out of them. I keep moving but see a guy who's interacting with a dominatrix at an S&M club. The dominatrix seems to be incredibly polite and the guy wants to like her but she is a shit dominatrix. She gets sad and I start talking to her. Eventually some dudes show up to pick on me and the dominatrix. I beat the living shit out of them. The dominatrix is impressed and asks you to help her improve her "dominatraxing". I do that. The guy comes back and sees a remarkable improvement. I completed that sidequest.
I just spent 5 mintues with that sidequest and then carry on to the bar. I do karaoke. I leave and suddenly get the hankering to play Outrun. I go to the local arcade and play Outrun for 20 minutes.
I leave and think, ehh I should advance the main story. I then proceed to the place I'm supposed to go and witness a cutscene and some dialogue which progresses the story and find myself in a situation where I have to beat the shit out of people with awesome music playing in the background.
Repeat until 100's of hours have been spent, and keep replacing the side activities with different side activities" and you know how a Yakuza game usually goes.