I must say, Nino, that was very commendable. I really really respect you for that. You just dunked on them xD
Poor Yotsuba, stuck between a bad situation and a rock. She suggested that she and Miku form a group with Fuu-kun but then Ichika has pretty much the same plan as well. She loves her sisters so much so I imagine that must have been REALLY HARD. Then, she goes on that sacrificial move. If you don't love Yotsuba, come and fight me. I fokin love her damnit.
I wish Miku spoke up. That would've been great. The threat is presented before her. I would totally love it if she reacted some other more confident way. But perhaps the confidence barrier break is probably being saved for something more important later. Maybe something like a confession.
For Ichika, I understand why she'd resort to such methods. I'm not really gonna say anything bad about them. Too many people are already dunking on her loool. Underhanded tactics are still tactics, no matter how pleasant. Her tactics are really risky tho. It'll all prolly backfire later on.
As for Itsuki, I don't really think she's the Rena 5 years ago. The present Rena who talked to Fuutarou, yes, possible. But the past? I just don't think so. I don't think the author is gonna use the "First girl really is first girl," card on this.