It's the distant future and the world of Eamon is at war, with a number of rival nations on the continent of Grancasa fighting one another over political and ideological differences. The aggressive Rojo Empire is poised for victory, but the leadership at the Adventurer's Guild believe that turning one of Rojo's allies against it will defuse the invasion. To accomplish this, a "control potion" will need to be secretly administered to the leader of the allied nation, but creating the potion requires the three elemental essences of pure water, pure air, and pure fire, all of which are hidden on separate islands in the Muerte Sea.

You and three other trained operatives set off to retrieve the essences, but two are almost immediately killed by a bomb, leaving just you and a single companion to complete the mission.

Details at Eamon Wiki