"At the very start of the game, the three protagonists of the story come to the aid of a young girl, only to be placed under the curse of the soul bind by the magician Darsul. To remove the curse and help the mysterious child, they have no choice but to journey where the path leads them.
While it's not uncommon for a group of adventurers to share a common destiny, this trio actually shares the same life bar. If any character takes damage, your group's total life will be depleted. When the gauge is emptied, the entire party will simultaneously let out a final gasp of life and collapse."
Sounds familiar?
http://www.gamespot.com/ps2/rpg/foreverkingdom/review.html