This was pretty nice actually. The art seems a bit inconsistent in some places, but I kinda like the mature look they're given (maybe a bit too mature for HSers even?)
Feel like there's no obvious villain here, there's just two girls who both have their issues to deal with. I think the romance between them was the right choice, but they definitely have a lot to work on, so the ending and how abrupt it was felt a bit off to me. And the apparent resolution that Rin's now completely diverted her attention to Momoka and essentially reversed the role of being the possessive, I think it's a bit unsatisfying.
After Rin walked past her friends and clung onto Momoka all day, I thought to myself that I hope she doesn't just abandon the friend she had, but I guess that's exactly what she does in the end.
On top of that, her convincing herself that Momoka will eventually leave her if she doesn't give her enough attention seems to me to go directly against everything that happened before this confession. I mean, Momoka literally said a day before that she was with others only to make Rin notice her (even if, as others have stated, that statement doesn't make sense), but Rin just completely ignores that? It makes me wonder what the point even was to spill it out like that.
I don't mean to say that I would've wanted a somewhat more "clichéd" happy ending, because I don't, but I think if the author really wanted to go down the "yandere Rin" route, they should've given the resolution a bit more cook time (I'm not sure it was ended by author choice or something else). Otherwise, an ending where Rin is still not entirely sure but they're both still willing to give it a go would in my eyes be a more fitting ending without adding additional chapters, where they obviously still have issues to iron out but at least are starting to be more open towards each other. Being on the right path, basically.
Still a nice a read though.