Dating your sis's ex, when you are in love with your sis. This can't be good, well yes, it could be super aangsty and dramatic and then turn sweet. Or the total opposite. Let's see.
I hope Kiku doesn't want to date the younger sister just cos she reminds her of Yuuna
well that will make it even more angsty
She better not be marrying a man, this mess is great and I want 4 girls dealing with it.