七都市物語　～北極海戦線～

In 2086, Earth's axis tilted 90 degrees and after three years span, approximately ten billion people died. One million colonists who had moved to the moon prior to the disaster escaped what later became known as "The Great Fall". At the moon, they established the Panhuman World Government and organized the recolonization of the world. Seven locations were chosen for cities as starting points for this massive project.