>>280034534
Well, those are hamsters. And to my knowledge Gainax never published anything that was serialized in a magazine aimed at young kids.
Looking up おるちゅばんエビちゅ we can see the magazines it ran in were aimed at older people.
https://www.shufu.co.jp/ (company)
https://pizazzcomics.jp/ (magazine)
There was some other magazines it was in that I couldn't find the websites for. コミックGiga and コミックShan.

I guess the crux of the situation is that Gainax was known to make more spicy stuff like Panty & Stocking while no one read Dragon Ball, or anything by Toriyama, for explicit sex scenes.

>Evangelion erotic artbook
Thanks for sharing. I remember they made a lewd official calendar too.
https://archive.org/details/neon-genesis-evangelion-nousatsu-calendar-2001/