smashkirby
Smash Hero
I got curious so I did some detective work (hehe) myself and actually found PDF scans of manuals from all four FDS releases:
1-1 | 1-2
2-1 | 2-2
Now for the weird part, Ayumi's spirit is from neither of those. We can safely rule out the first game because she wasn't in her uniform there and the third game due to being a digital Sattellaview only game (as well as the advertising using a vastly different style), meaning it has to come from the second game. Though as I said, that piece of artwork wasn't used in the FDS manuals either, closest would be Ayumi's mugshot on page 11 of manual 2-1 and even that has some big differences. And as for the SNES release, it was Nintendo Power exclusive, so it didn't come with a box or proper manual either, as well as also (famously) using a vastly different artstyle as well.
I'm not saying this is pointing to a new game... but it's pointing to a new game. I'm joking, of course... but wouldn't it be just neat if it were true?