In the distant future, mankind has colonized the galaxy on a number of platforms known as islands, governed by a ruling class known as the Aristocrat Alliance. However, internal struggles for power lead to a bloody civil war, which eventually leads to both the creation of a much stricter order that calls itself the Holy Empire, and the exiling of the old royal family. Despite overwhelming losses and heavy numerical disadvantages, a rebellion continues even after the war comes to a close; the future continues to look bleak. Yet, when all hope seems lost, the last remnants of the royal family return with a mysterious "glass fleet," joining the rebels and turning the tides of battle once more.