I believe Dai Gassaku was a collab between multiple artists to celebrate an anniversary of Afternoon magazine, ten years or something. So it’ll have been the artists contributing to the magazine at the time.
Which makes sense now I think about it - the standing/stretching Bell on the left does have a slight whiff of Kenichi Sonoda about her, and he’d have been in mid-Gunsmith Cats around then. Other than that, I dunno… bottom left = Kia (Silent Möbius/Nadesico) Asamiya…?
Which one is Big Sis?
I don't get it~~~~?!So many Belldandies...?!Keiichi-san!
I'm here!Aah~~
Keiichi~~
Here~~...Aaa~~
Keiichi-chi~~~nNow! Where's the real goddess!?