Finally. It was about time Aya get sick of this farce of substitue play. Sei really need to let it go and see Aya as Aya and not as Yoru. Hopefully Yoru is here to help her.
Hopefully next chapter is Sei and Yoru having a proper conversation to help Sei move on but usually with these things it'll most likely end up just causing more drama.
The angst is hitting the roof, I’m glad Aya broke things off now let me see Sei beg to get her back. And what the fuck is Yoru doing there, she knows she can’t love Sei back so she should just piss off.
She forgot that the picture was there but obviously Aya wouldn't know that... but it was necessary because she kept calling her Yoru after all.
I keep reading this as one of the best yuri works in later years but I can't say much because I basically have my heart exposed saying "please don't stab it..." I feel like I'm in the longest cliffhanger of manga history and I can't calm down until it clears out.