Yes, the Scarlet Devil School generally use sliding doors as we can see from the previous strips. Also if I'm not wrong, it's common for Japanese schools to use sliding doors.
Daaaw. You're nice Aya. Giving your time to Momiji <3
Maybe next time.Oh...After School.Aya, how about if we go home together?How rare, being a party pooper like that.Whoa.I'm sorry, but I've got some club activities today......Noble and HonestAya-san, say "Ahh".What the?! It won't open!Tweedle-ing