As for the sexuality of the MC, I don't think she's bi.
As far as we know, she just dated that guy and didn't have sex with him.
Then, she admits herself that she didn't really love him, but that it was an artifice to hide that she was with him out of selfishness for adding a tick to her life-checklist, and she preferred the long distance because she thought it wouldn't be too obvious. But then, she repeatedly invite him to Tokyo (to tie him up more?)
So, I'm not sure we can define her as a lesbian at the moment (2 chapters in). More like aromantic/didn't meet anyone she would have feelings for. By default, she would think it will be eventually a man, but it may well be her roommate in the future.
If later in the story we learn that she had things going with girls when in high-school/college, I would revise my opinion.
As for the accent, she mentions she comes from Kyushu and, according to tvtropes: "It is also regarded as a typical rural accent as well as Tohoku dialect, but Kyushu speakers are often viewed as rough, dynamic and stubborn.", which would fit her personality. In the end, I still think that the first chapter was an easier read than chapter 2, even if the accent is "translated" in both.