while I'd support the release here, this isa game that we'll most likely never see on GOG.
It's free on Steam, but you need to change your coutry, since it's not meant to be available in western countries.
It is a pure service / Gatcha game, neverending grind week for week to get some currency for chanses to get swimsuits, new characters and to buy new poses and environments for photo shoots. The volleyball "gameplay" runs automatically, it's defined by equipment. But you can change the tactics during a match, that's something. You can also spend real money for chances to exclusive outfits.
While this would be nice to have in an offline version with everything unlocked :P, I'd rather go for DOAX1-3, which actually have decent gameplay in some of the activities.