Since you'll play the Sega CD one, here's a little hint: During the game you'll have three characters to switch between and some of the dialogue/story parts are different, according to the character you're currently using. It's worth to save often, so you can go back and play certain scenes again with a different one, to experience some interesting changes. It doesn't affect the gameplay or the ending, but lets you explore the individualities of the other party members.