This manga is doing well enough to last for longer, so if it ends, it'll probably be because the author decided to wrap it up, she has her other manga going on after all, and this feels like a very cozy ending point.
But thing is, with this premise it's easy to introduce conflict, like, there are several that comes to mind such as:
*. Dwell deeper into Asako's past dating life, like an EX-GF entering the frame to flare up her insecurities and test the relationship.
*. Dwell deeper into Miyako's past life as an idol.
*. Asako's nature backfiring in some way with Miyako. (We've seen bits of this, like in chapter 19)
*. Both of them dealing with their families in some way or shape.
etc etc
Or the story could go in the direction of the girls simply spending time together and getting even closer.
So who knows, if the author wants conflict, there are a lot of ways to go for it, on the other hand, if the author wants to wrap up the story, this is a good point too.
I still think that the manager stalking one of her charges should've been addressed.
Same, but thing is, you hear a lot of weird ass things when it comes to idol managers.
So what in our eyes is a massive "WHAT'S WRONG WITH HER!?", in the mangaka's eyes can be some normal behavior not worth addressing, I guess?
(Or maybe she simply doesn't want to deal with it as her approach to drama is a rather softer one)
The Japanese idol industry works in ways beyond our understanding.