I'll buy the teacher knowing about them swapping bodies, but her using the exact same term for it is weird. Exchanging, swapping bodies, exchanging bodies...
it loses out on how 'special' the ability is if the author keeps introducing more and more characters with the same ability. First Haruko and Natsuko, then Fuyumi and Akiho, and now Chinatsu (sensei). But none the less I still enjoy the fluffiness.
Besides that...
Swap Swap Vol. 1 - November 28, 2015
Swap Swap Vol. 2 - December 27, 2016
Swap Swap Vol. 3 - January 27, 2018
About every 13 months a new volume is released. We'll just have to play the waiting game until Feb 27, 2019 (or a bit later).