I'm prone to crazier dreams than most(Let's just be honest and say all!) around here.
:nods in the general direction for part 3 of the Jaunt Trooper series still stuck on some DEC Machine someplace in the world..and that crazy rare Dicing Knight followup stuff:
Still, the Japanese Roguelike community does "stuff"...just so obscured I can never find anything close to a reliable beat on it/an actively known Rogues Gallery the likes of which somewhat exists on the Goggle/Newsgroup and here in terms of folks out and about working/trying to work/having worked on something(s).
Step one would be a good translation of the scan to reveal the gist of the setup/system at play for it/better zoomed game screens for little details---was it in a Dragon Crystal/Fatal labyrinth style, something ahead of its time in a proto-Mystery Dungeon configuration, or unique construct?