I'll remember Demo Demo PlayStation mostly for including a playable version of Bounty Arms, yet these discs are interesting beyond that sample of my most-wanted unreleased game. True, Demo Demo volumes are bare-bones compared to the Play Play series. Play Play discs come with plenty of extras, commercials, original games, booklets, and glossy designs. Demo Demo discs just get covers with generic comics. That's understandable if these cases were meant to sit idly on a shelf while the disc ran in a kiosk somewhere. Sony gave Demo Demo covers to any manga artist willing to sacrifice a few panels to obscurity.
My favorite Demo Demo PlayStation cover comes from Volume 11, because it’s the only one I even remotely understand.
If this were a good website like Magweasel, I’d have a detailed translation of this comic. It’s not, so here’s a crude guess (edit: I am, in fact, mostly wrong; see the comment below). Starting on the upper-right and going clockwise, we find two girls wolfing down cake, with the brown-haired one fretting about gaining weight. Her blonde friend points out that she’s not worried about her own figure, explaining in the second panel that “games” keep her thin. I assume she’s talking about sports.
Our heroine, being none too bright, interprets this to mean PlayStation games, and the next panel sees her embracing a “Game Diet” with the help of her trusty Sony-manufactured game console. This diet presumably consists of her sitting around all day while playing Ridge Racer, Philosoma, and maybe even Hermie Hopperhead. In the last panel, she laments that she hasn’t lost any weight on the Game Diet, while the blonde girl laments the unfathomable stupidity on display.
Edit: Since I guessed wrong, here's a actual translation.
Brown-Haired Stupid Girl: We’ve had so many sweets this fall, we’re going to get fat…
Blonde-Haired Smart Girl: Oh, I’ll be OK.
Smart Girl: I lose weight with video games. I play them so intensely, I don’t have time to eat, you know?
Stupid Girl (vagrant floating thought): Really.
Stupid Girl: All right! I’ll try it too! I’m on the Game Diet!
(Headband: Something about losing 5 kilograms. It’s hard to read.)
Stupid Girl: I was so bad at playing games, I got depressed and started eating. And I gained weight!
Smart Girl: You are such an idiot.
This sort of allegedly classic humor has entertained manga readers for decades, yet there’s something charming about this little throwaway gag. Perhaps it’s the way the comic unwittingly predicts Wii Fit fourteen years down the road. Or perhaps it’s the backhanded, Sony-endorsed admission that playing video games will make you a gloomy fatass.