Yea, there's a plot. It's very simple and all, but okay. The plot basically gives you a reason why you need to carry the chalice in the game (the miasma). The 1-player and multiplayer stories are identical. In fact, you can continue off a multiplayer save when your friends aren't around and play it single player. A moogle will carry the chalice for you in that mode. If you bought GBAs just for this game, well, I don't think it's worth it (though you should have a GBA anyway). 2-player, the game is pretty fun, but the more, the better. Think of it this way: you needed a GBA anyway, so you should be glad you have one now. Now you can play all the great games on GBA and play FF:CC as well. Try it out with more players and it'll get better.