I'm still on board so far. As usual, everyone is not without their faults.
Yuni was swept up by Fuuko, but still loves Nanase. She's developed something for Fuuko though, only time will tell; I can suspend disbelief enough. Perhaps some consequences for her actions later?
Nanase realizes her shortcomings and will try to make amends as she still loves Yuni despite the cheating; fine, I can suspend disbelief. I don't think it'll work out, but I'm interested how it'll go.
This is the first time Fuuko is rattled and upset at not being chosen by Yuni. In her own way, she did do everything right. Aside from making someone who didn't want to cheat on their partner, she comforted someone who was lacking love, was there for them, and fulfilled them as they needed/wanted. To Yuni, she 'should've' been the perfect girlfriend she was hoping for. But still not being chosen because she's not the official "girlfriend".
Looking forward to some Fuuko time. See ya next month.