So the official manga serialization based on the mobage of the same name has started with the 1st chapter already out on
Bilibili manga. New chapters will be out on the 23th of each month.
The 1st chapter is based on Chapter 0 of the game where our protagonists, AR (Anti-Rain) Team, attempt to recover a hidden top-secret data at an abandoned facility in Sangvis Ferri terrority only for SF forces to attack their location.
Also there's going to be a
Girls Frontline manga anthology(called Dolls Frontline due to copyright reasons) that will be out in Japan on 27th November.
EDIT:
Official site to read the manga