I hope the mom collapsing becomes a way for her to accept her daughter wanting to contribute more to the house income by having a part-time job.
I mean, collapsed because of overworking = will have to work less for now. And someone needs to help pay the bills, or at least without having to give her daughter pocket money because she'll handle her own expenses might help out overall. Author, just please don't kill the mom before she gets to meet her in-law and say "Good job, Hikaru".
Also the friend is a wild card. I don't know if she'd be jealous by knowing they really are romantically involved, if she knows and just pretends she doesn't because the school would explode if they knew Kairi is taken, or if she's your average straight friend who doesn't
believe two girls can date until she sees two girls dating.