Front Mission 2089 and its sequel Front Mission 2089-II serve as the fifth and seventh main entries and the seventh and ninth overall entries in the Front Mission series. They were originally released on mobile phones and later ported to the Nintendo DS as Front Mission 2089: Border of Madness.
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.
The plot of Front Mission 2089 revolves around a group of mercenaries led by Ernest J. Salinger. Given the codename "Storm", Ernest conducts sorties near Mail River. While many of the sorties involve basic reconnaissance and data collection, the mercenaries detect abnormalities by the border. Mercenaries hired by both sides begin mysteriously disappearing, and many of them were last sighted near Mail River. Unsure whether or not the mercenaries are deserting their duties or are truly disappearing, Storm's superior officer Falcon orders them to investigate these disappearances. During their investigations, Ernest and his group come across an unknown mercenary outfit known as the Vampires.
These are the recurring characters whose first appearance was in Front Mission 2089: Border of Madness, which is a remake of Front Mission 2089. The video game takes place from 2089 to 2093.
Ernest J. Salinger - Ernest J. Salinger is a former O.C.U. captain and a mercenary employed by the O.C.U. He was the part of the O.C.U. Ground Defense Force (O.C.U. GDF) 13th Battalion, B.A.T.S., but left the unit for unknown reasons. Salinger's mercenary codename is "Storm". Ernest also makes an appearance in Front Mission 2089-II.
Kate S. Houjou - Kate S. Houjou is a former operations coordinator and a mercenary working with the O.C.U. military. Her past line of work got her involved with the Central Intelligence Union (C.I.U.) on many intelligence operations. Houjou's mercenary codename is "Oddeye". Kate also makes an appearance in Front Mission 2089-II.
Lycov - Lycov is an engineer in the employ of weapons developer and medical conglomerate, Sakata Industries. Lycov worked with the company to create Bioneural Device-use models. His real name is "G. Lycov", but few know what the initial "G" stands for. Lycov also makes appearances in Front Mission 2089-II and Front Mission 2.
Stan Williams- Stan Williams is a former mixed martial arts champion and a mercenary working with the O.C.U. military. He won the Triple Crown of mixed martial arts, but left the sport in search of more "meaningful" work. Williams' mercenary codename is "Champ". Stan also makes an appearance in Front Mission 2089-II.
In fall 2007, Square Enix announced that it would be creating a remake of Front Mission 2089 on the Nintendo DS and named it Front Mission 2089: Border of Madness. The games producer Koichiro Sakamoto indicated that a survey of the series fans showed that most did not play games on their cell phones, and so Square Enix decided to bring it to the Nintendo DS. This remake of Front Mission 2089 featured completely remade visuals, new character artwork, new cut-scene events, a rewritten story, new game scenarios, and new battle maps. Also incorporated in the game were touchscreen features and a revised interface for more intuitive touchpad controls. Likewise, various game play mechanics from other Front Mission entries such as armor coating and linked attacks were added to Front Mission 2089: Border of Madness. Multiplayer mode had to be dropped due to space issues on the Nintendo DS.