Wow this mangaka sure dislikes the oldest sister huh? She and her partner have had like one or two chapters. This series might as well have just been about three sisters instead of four. Kinda weird to axe off a supposed part of your story so early on.
Consider re-reading the chapter titles again. The author is pretty consistent with progressing each stories.
gets a confession goes on a DATE
"Hey, I really do love you" suprised pikachu
Eh...I can never make sense of such weird misunderstandings in yuri manga. If it were platonic only, the mood would be totally different. And why use romantic terms like love and date if you don't mean it?
It's not really that weird. If you hang around with Asians who grew up in Asia most of the time if they say they have a date with a friend they just really mean hanging out and not really going on a date because they like each other that way.
I understand Amane has nothing to do with who Nene dates now since they clearly had broken up. But it was a jerk move of Nene to do that to Amane. Poor Kou, getting caught up in this mess.
I really want Amane to move on and realize sometimes people just lose interest in their own partner. I hope she find someone else better and not senpai please for the love of the author. Not senpai.