Wow that means chapter 25 which is in volume 5 won't be released in English until 2018 probably.....
Maybe, they'll release the volume 5 before 2018 because when you see the releases date of the three volumes, there're 2 months between each of them. So, it would be logical to guess you'll have the volume 4 in may 2017 and the fifth in august 2017.
Maybe, I'm wrong and SuBLime can do what they want (they also have to work on their other projects) but, in Japan, the 4th volume is released today and Rihito Takarai draws two tankoubons per year. I know she's taking a break until next january but she's prolofic so, the fifth book should be published in Japan around the middle of 2016. Thus, it's possible for SuBLime to release the fifth book in august 2017 and not in 2018.
what if I die before that Lol
V1 August 2016
V2 November 2016
V3 February 2017
（/TДT)/ crap
~ https://www.sublimemanga.com/titles ~ here for anyone who wants to browse for now lol