I wonder if this translation can work (help) for the Sega Saturn or the psp collection...
Based on my experience translating this, I'd say yes. The PSP version is more or less a straight up port of the PC Engine version. The only differences are that the menu theme "P.S. I Love You" was removed for copyright reasons and the game is missing the Bomberman theme during the swimsuit contest.
As for the Saturn version, the script in the remix is 99.99% identical to the original, with the few changes being pretty much cosmetic. A few additional things might have to be translated for that version like the omake calendar mode that wasn't in the original, but otherwise the translation should be able to be brought straight over from the PC Engine version. Further helping matters is the fact the Saturn version has the script encoded in Shift-JIS, the exact same format used in the PC Engine original. In fact, just about every Yuna game regardless of platform uses that format.
If anyone has the spare time and would like to take a crack at porting the translation to those versions, be my guest