Wtf. I remember watching the first 3 episodes of this anime like a few years ago and dropping it cause it was cringe but now all I see is Tomoko being a chad lesbian magnet in every doujin, ship, and image I see.
^Major character development after 2nd year school trip arc (chapter 60ish?)
Highly recommend getting past that point because it's sol yuri (albeit mostly subtext) heaven, but you need to stick through the cringe to appreciate everything. I haven't watched the anime but I don't think the anime ever got past the cringe so you'd prob have to read the manga.
^I estimated her speed at mach 1-4 which is right- not that that is much more reasonable lol :) I didnt check up what it was in m per second tho- and BVs stated 1km per sec = mach 1 sounded reasonable- but you are right mach 1 is about 1km in 3 sec.