Ah, so you notice that small print too?
Yep, and I'll be honest, I can already imagine what's about to happen in this "yakuza arc":
1. That drunk guy is a new small fry wanna be yakuza and after "confronting" the MC, ends up "humilated";
2. He calls for his aniki, which is another small fry leading a group of small fries, to get back at the MC;
3. In the meantime, the new girl start to get interested for real about the MC;
4. At the moment she and the MC goes out, after the end of their shift, the group lead by the drunk guy attack them both;
5. "Plot twist" moment: The aniki notices that the girl is actually the daughter (or at least a close relative) of their boss or someone really important that they should not mess up with;
6. The drunk guy is now pretty much fucked and the new girl reveals herself (at least for us readers) as the new rival that is ready to conquer the love of the MC, by all means necessary (if she's related to yakuza).
It's just a a theory tho.