@donm527 I figured so and couldn't get it out of my head... The pictures in the background tripped me up and made me a bit nervous. And you are right Ichika did hurt her ankle but, she said it wasn't bothering her.
Based on the plan that Nino came up with to kiss Fuu-kun, I would say the most likely one at the bell was Ichika or Nino. But, that doesn't state everything, just because it was a plan that was already in place, doesn't mean that one of this sisters couldn't have just raised up the courage to take the first step to a relationship.
Anyone could have kissed him on their own accord... except Miku... That wouldn't happen.
I was also looking at chapter 50 like seihanda implied but, all chapter 50 confirms for Yatsuba is litterally what she said on chapter 72. That she just sees Fuu-kun as an amazing person. In no specific way has Yatsuba's true feelings been said.
Oh yeah and I got the pun



ahhhhh (sigh)... yeah.
@grumblerumble It's a stretch to say once you've read one you've read them all. This is a harem only in name, this has no filler. Each chapter is so fast paced that we can barely hold on. Filler is not flashbacks, fillers are more like a break for the readers when something is TOO intense, (or when they want to hold on to fame....ONE PIECE.)
Kinda like a cartoon episode with no meaning.... Like family guy, no meaning, nothing plot changing... pointless, mind numbing.
Give this a try and see if you can actually see the difference in this story, compared to the Ecchi Harems that, quite frankly.... suck.