By 1991, with more powerful alternatives taking root and more pressure to expand to consoles, the PC-8800 line of computers was entering its twilight, but Falcom pledged to support the hardware to the hilt—in reality, they'd already began development on multiple computer games for which there would be no 88 versions, but they did put their best foot forward with Popful Mail, a side-view action-RPG that advanced on the format established by Xanadu and Romancia while integrating a more contemporary character aesthetic with a eye towards being a media-mix property from the get-go. (They even put a little "hey if you want the next Legend of Heroes game on 88, ya better buy this game" message on the box, and I guess it worked because The Legend of Heroes II ended up being their next and last PC88 game.) They also made a point of supporting several hardware modules for the first time, up to and including the CD drive for BGM. (This EGG version only offers the YM608 Sound Board II tunes, as far as I'm aware).
This game has an outsized reputation overseas thanks to the Sega Falcom-produced, Working Designs-localised Mega CD remake, so I suspect a lot of people might be surprised to learn that the PC88 original (as well as the 98 version, which is basically the same game at a higher res/colour count) are bump-combat games in the Falcom tradition, and not Monster Land-esque arcadey action games like the console versions. That's not to say the original version wasn't trying its hardest to present a more streamlined, production-focused experience a la the console action games of the day, though, and I'd say they did a commendable job given the limitations of the hardware—seeing Falcom really try, and very nearly succeed, at providing that experience on PC88 is more interesting to me than the Mega CD or SFC versions, which both released in '94 but paled in comparison to the most of their contemporaries.