Sword of Mana tells the tale of two unlikely companions, a former prisoner out for revenge and the last known girl from the Mana tribe. The two come together, despite their differences, for one very important reason: they are the only ones that can save the Mana tree.
Like in other games in the series, the player can take control of both characters (or join with another player in co-op) and participate in action-oriented battles using spells, weapons and different kinds of items.
Despite the game's package stating something about multiplayer, two players do not battle an enemy simultaneously on screen. When you need help, if you have the Game Boy Advances linked, you can press a button and the second player will drop down onto the enemy then drop off screen. Rumor has it that trying to get the players to battle an enemy together proved not to be working on the GBA so it was, more or less, dropped.