I'd wait until a few successful RPG play together runs before attempting games like Linda3, Gulliver Boy or Blood Gear, which are non-linear(ish).
I'd also avoid Monster Maker, which I really like, because of a game breaking bug near the end.
Xanadu I and Dragon Slayer II would be tough for non-hardcore Japanese RPG players, since they involve too much specific fetch questing and specific NPC chatting.
Anearth Fantasy Stories, although non-linear at the beginning, would be one of the best games to play, as it's high quality and has an amazing walk through.
Neo Metal Fantasy isn't the best choice as the first game to play. Xanadu II probably is just to see how many people can make it through even such a short game. But NMF should be high on the list for one of the runs, since it will likely surprise people with it's unique story/art/character style and Phantasy II/IV style design.
Although I haven't played far into it and there isn't an English guide for it, Cosmic Fantasy IV Chapter 2 would be a good game for this.
I've only played through about 3/4 of Xak I, but I didn't need a walkthrough, so I imagine both games are straightforward enough.
Benkei Gaiden is cheap and awesome. A very satisfying HuCard RPG to play. The Japanese guide(s) for it is easy enough to follow.
If this actually lasts a past a few games, it'd be cool to do Might & Magic III.
