In 1974, Latin America becomes a key to maintaining the power balance between the East and the West yet Costa Rica has miraculously managed to maintain peace and neutrality. But in the country's various regions, a mysterious armed force seems to be engaging in specific activities. While stationed in Colombia, South America, the mercenary company Militaires Sans Frontires (French for "Soldiers Without Borders"), led by Big Boss (Naked Snake) and Kazuhira Miller, are approached by visitors (Ramn Glvez Mena and Paz Ortega Andrade) from Costa Rica. To preserve peace in this "nation without a military", the MSF moves into action and will come to be known as the founders of "Outer Heaven."