What a disappointing ending. Don't get me wrong it's a decent story but it could have really been a great story. If someone told me that it was axed and the final chapters were rushed, I wouldn't doubt it for a second. I don't want to believe that the author did the setup so perfectly only to trip at the finish line.
I mean, Mei's teacher showed her that the polyyuri route was possible. The counseling session fixed a lot of her misconceptions about relationships and also helped the other characters move their relationship forward. The Rinna x Sayo moment even offered a teaser of what we can expect. All the author had to do was follow the arrows laid out in front of them and finish the story. Instead, it seemed as if they wanted to subvert expectations, which is fine but the execution just wasn't there.
I'm not even mad that the polyyuri ending didn't happen. I'm fine with Mei x Sayo or even Mei x Rinna. Hell, I would even have been fine with Sayo x Rinna . But the execution needed to be there and it wasn't. Five or ten more chapters could have really helped resolve things smoothly.
We would get to see Rinna's recovery which I think is really important. After all, she quit being an idol to chase her true love because the love of multiple people just wasn't enough.
How they managed to remain friends and roommates. Rinna and Sayo were already really awkward about the accidental kiss. But with Mei x Sayo being the final pairing, how do any of them deal with their feelings.
Also, the scene of Mei, Sayo and Rinna in bed together felt really forced. Like it was put there to appease the polyyuri crowd. It just didn't feel genuine. If the author wanted to show that their relationship is still on positive terms, they should have found another way.
The ending legit turned a potential 8/10 story into a 5/10 story.