Annoying flag. All this self sacrifice means that Ebino's path is almost sealed. And what's with Ririsu's suggestions to Ebino? They are extremely rude.
Hope that author didn't take sides... I mean it doesn't connect to the backstory. He combined childhood friend and ugly duckling tropes...
Nay... I think sexual insecurity for most students would actually grow. Not to mention providing new material for bullying. Everyone in this manga are just too friendly and goody to each other. Not so much in real life.
I recommend everyone who consider her actions as full-fledged bullying at least read up to chapter 3 included. Senpai himself proves you wrong. And Nagatoro has twisted personality but she never crosses the line and periodically self-reflect.
Personally I am waiting for some real "challengers"...