Thoughts [Feelings?]:
I feel like Itsuki is only disguising as Rena based on what Fuutarou told her at the hospital.
I feel like Yotsuba is Lolikano. Intuition. I'm late by some chapters so maybe who Lolikano is already revealed, but I'm going with this.
I feel like the Miku at the room is actually Ichika. She traded places with Miku as Miku is seen running with Fuutarou [Fuutarou knew it was Miku himself.]. Also, the Miku at the room said "Sorry Nino," near at the end.
I feel like the real Miku is gonna do something now. I think Ichika gave her a chance or something.
Feelings for thought