This could get pretty interesting if it dives deep into why Watanabe has so little self-esteem.

tbh I thought the story was going to end after the parent confession arc

IMO it should've ended there, with this chapter serving as an epilogue. That Madoromi chapter was awful, and in hindsight feels like a really weird second-to-last chapter to me.

"Rather, it makes me smile."
Yoshioka proving once again she's the best character. I agree with Gerosuke's post, imagine if she were the MC.

it's like someone realized that the volume is ending and there is still plot to advance

I feel like we don't really need any of this (the male coworker, Rio) to advance the plot, though. I think it would have been more natural to, after their separation, build on the growing romantic feelings between them. It could have been an interesting story about a relationship that is romantic in nature, but not sexual (with the absence of sexual desire (and acceptance of it) being an actual theme, something I was quite excited about when starting this manga). It might still end up being about this, but the pacing and tonal shift of this chapter is pretty jarring.

So Hii-chan never gets off? Rough.
Cover looks amazing, though.

There's no way they're introducing a new love interest for Ari right?

And please indulge me, what kind of blackmailing and ntr are we talking about?

Well is really spoilery but

from chapter 28 and 29, new girl love target is Nanase, so she caught Nanase in harassing mode on Momo in the nurse office, so she use that to make a move on Nanase using blackmailing, then immediately procced to get sexual with Nanase in front of Momo, watching how new girl just touch a naked Nanase all over the place for 10 minutes (thats the sort of ntr, trying to take her forcefully in a sexual way, well i said sort of) until Momo stop her from trying to kiss Nanase and new girl snap, but probably chapter 30 this gonna get brushed off as comedy or some shit

Interesting, thanks for the reply.
If anything should come from that, I hope it'll be Momo realizing something regarding her own feelings toward Nanase (seeing as she stops the kiss).

the serie been going ok because of the other 2 characters

I agree. I don't think I'd mind it if this manga was purely about Ren and Ginno. Or at least, if Nanase is about to do / doing something inappropriate, show how utterly desperate she is, like in the first sleepover chapter (which is by far my favorite Nanase/Momo moment).

And please indulge me, what kind of blackmailing and ntr are we talking about?