Well, I was pretty off the mark with my previous comment, but since the previous chapter hinted a "yakuza arc", I still think that the new girl is related to the yakuza somehow...
My bet still on she's the daughter of some yakuza boss and because of this she needed (or was forced) to learn...
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...
Firstly, thank you for the translation.
Secondly, it looks like a new girl will be thrown into the mix of "rivals who actually have a chance with the MC", along with vtuber-chan. Nice.
Third... “yakuza arc”?!