I had a hard time getting through the first few chapters. Nagatoro was a straight up bully at first, but she dialed it down to teasing instead of straight-up harassment after that. Her Senpai starts to like having her around. Later, Senpai starts to tease her back a little, and it's hilarious.
@UnknownSaint111
That's the one I was looking for when I read this one. I thought, "wasn't it about kids, not teenagers?" I'm going to go read that one now.