暴食のフォルム (Boushoku no forumu) or "The Shape of Gluttony" was published on November 1st, 1982 in Boys and Girls Complete Competitive Collection of SF Manga (少年少女SFマンガ競作大全集) Part 8. Furinkan notes that it came out between chapter 56 and chapter 57 of Urusei Yatsura. Which is around Volume 6. I was unable to previously locate this translation of it and did not post it even though I was posting Rumiko Takahashi one-shots alongside UY. So, this was around forty years before the chapters in the Rin-ne volume I posted in this thread.

This translation is a fanscan. Of course, as unofficial fanscans and translations, they have their own issues but at the least we don't have to worry about flipped art. This story has six pages of full color. It seems the fanscans found the original printing of the story, which is great.

This fanscan is actually by one of the creators of Furinkan who translates many of these interviews and compiles the site! It is unusual to see this, but they have previously translated similarly obscure Rumiko Takahashi manga before. I honestly wish they'd translate more of the works themselves, but I assume they don't want to get in trouble. No cover really, we start right away!