Huh, I'm really surprised by the comments here. I thought this was a pretty positive chapter that had a lot of touching moments as characters worked through their issues. Yeah, they're all shitty people, but you should have figured that out 10 chapters ago.
Aya and Sei both admitted their feelings, and Yoru left. The only real stumbling block left is Sei. I'm guessing the manga will end during this volume (4) at chapter 20.