Set in 2089, the story of Front Mission 2089 takes place on Huffman Island one year before the 2nd Huffman Conflict. A series of skirmishes across Huffman Island in 2086 causes chaos on the island. The O.C.U. and U.S.N. send in peacekeeping forces on their respective sides of the island to quell the violence. This conflict, known as the "Huffman Crisis", increased tensions between the two supranational unions. By 2089, both super-states increase their military presence on the island and begin hiring mercenaries from all over the world. These mercenaries were then sent on espionage and reconnaissance operations around Mail River - the border that divides the O.C.U. and U.S.N. territories on Huffman Island.