Y'all a fight doesn't mean they're heading towards a breakup. Couples fight, it's normal. This is good. Aya is expressing herself, if kinda of in a shitty way, but she's right, Mitsuki can't take status quos for granted. She should have learned that lesson in high school with the prom. Instead, like for many of us, she only learned it situationally and needs to relearn it in a new context.
And also this is not coming out nowhere.
It's also not the first time she's tried to deflect Aya's questioning with sex, post-timeskip.
I'm kinda excited about what's in store. These two
are tight-knit. Fights and friction are absolutely natural in relationships, and honestly if they were just smooth sailing the whole time I'd question what was going on beneath the surface, because keeping it all bottled in like Mitsuki's been doing
will lead to bigger problems down the line.
So yes. Aya is in the right here, trying to compel Mitsuki to talk to her. I'd argue she should have kept pushing instead of simply walking away, but it was also like...what, after 5am and she was out all night at a concert. I'd be blasted too from that and too exhausted to deal with whatever Mitsuki's actively trying to avoid in the moment. Go to sleep, "cooler heads prevail" come morning, etc.
I'm sure this will lead to the issues between them compounding before they get addressed and resolved, but this
is the big plot point of the College Arc moving forward. Mitsuki's adrift regarding her music career and is understandably burnt out and scared over what the future has in store for her. Aya's stressed over college courses, and the two haven't made
real time for one another because of their schedules and to-do lists.
Plus, we have Shu and Rinko showing up now, and I suspect they'll both be important narrative-wise in helping Aya & Mitsuki address things.
I really don't see this going the way of an actual break-up, because of the history and foundation between them...but ups&downs like this are a part of life, and offer chances to grow and reinforce relationships.
They just need to actually work through it together, haha