I believe one of Enix's first game was a hentai style game. It's on wikipedia.
JESUS: Fearful Bio Monster. There's just one moment of pseudo-nudity. It's from 1986, and has Koichi Sugiyama (from Dragon Quest) as a composer. In fact, in JESUS you can hear a bit of the Dragon Quest I field music playing on one scene.
(PS - there's a Japanese YouTuber with a Let's Play series of JESUS ... I believe they call them "ALLPLAY" instead of "Let's Play" ... it's a 4-part series).
A few years later they did Angelus: The Devil's Gospel, which was much the same sort of game.
I'd really like to play these pre-Snatcher super-old games someday. Another one that's caught my interest in the last year is Hokkaido Serial Murders: Ohkotsk Vanishes.
Among all these games I've seen, the Square one looks bloody awful. Tons of re-used animations. Without text in a language you can decipher, the graphics are of no help whatsoever.
If I meet Uematsu at Anime Boston (and I very well might), I intend to ask him if he remembers ALPHA.