http://www.dlsite.com/maniax/work/=/product_id/RJ181864.html
http://www.dmm.co.jp/dc/doujin/-/detail/=/cid=d_098838/

002-140: Gyaru version, Text
141-279: Gyaru version, No Text + SFX
280-418: Gyaru version, No Text
419-557: Non-Gyaru version, Text
558-696: Non-Gyaru version, No Text + SFX
697-835: Non-Gyaru version, No Text

What is this about?

Base +14, Lostalgia +6

Is this the sequel to his previous CGs?

Base +12, Lostalgia +6

This is the fourth and final chapter in the series that had three prior installments about the giant breasted squadron Three Gal Group. In the first two, Yellow and Blue were made into sex slaves by middle aged guys who were former combatants for the Dark Void group, but left because they were tired on losing. In the third, Red ends up going up against the Dark Void leader by herself, gets captured, and then brainwashed into being "Dark Violet." However, she got also turned into a sex slave by the middle aged dudes, which caused her to break the brainwashing and then kill the leader of Dark Void. This is after the Dark Void has basically been destroyed (except for some mopping up), but the girls find that escaping their desires is more difficult than defeating Dark Void.
http://g.e-hentai/g/758142/9d48b81197/
http://g.e-hentai/g/825271/2b88a9241e/
http://g.e-hentai/g/889456/ccc99f1104/

Base +4, Drksrpnt +46, nikaido +9, Lostalgia +6, Ost666 +6

1G?
(|||ﾟДﾟ)

Base +5