Typical Gorou: clean, pure girl gets taken by ugly men and enslaved forever.

Sums up just about all his works.

Base +9, ia64 +5, Darkzanza +2, heebeele +3, konakona1024 +7, Blopa +10, stupid army +6, imonlyhere4porn +6, deadarm +6

Translation (if it really is one) is a little wonky. "The bataaku alien the most vicious beings in the planet." Ok do they mean ON the planet or in the galaxy or universe, here?

Base +8

https://www.doujinshi.org/book/36630/VV/
RAW: https://e-hentai.org/g/99961/82e2ec25cc/
Korean Translation: https://e-hentai.org/g/878526/eaf3b0af13/

Base +54

LOTS of heroines in this one and most of them and their shows are untagged. I almost don't know where to begin. Every girl in the doujin, their show, and their page of first appearance
Chizuru Nambara of Combattler V and Megumi Oka of Voltes V are of course the main characters.
On the front Cover/Page 1, we have Midori Fujiyama of Gaiking, Michiru Saotome of Getter Robo, Jun Hono of Great Mazinger, and Mai Kazuki of Gackeen
On the Back Cover/Page66, we also have Yuri of Baratack, Miwa Uzuki of Kotetsu Jeeg, and Maria Freed of Grendizer
The announcer girl on page 13 is Ikue Sunahara of Trider G7
On Page 19 we have Princess Fala of Golion and Princess Romina of Tobikage
On Page 21 we have Midori Fujiyama, Yuri, Haruka Kaga of Dairugger, and Michiru Saotome.
I think with that I've identified every girl at least once.

Base +6, Geofront +7, crazybongo +6