I would've been fine with poly or what we got but not with Rinna only, it would've crushed my heart because Sayo loved her so sooooooooooooooooooooo much and for such a loooooooong time too! But because of the arrows and the problem it caused, her happiness was denied before it could even start, the childhood friend winning is precious!
The comment section is so divided lo/ also I like Rinna too of course, I don't know what the last chapter might have but it might be awkward to keep their relationship so close if one is third wheeling... I mean, sharing a room and all that