The Holy Britannian Empire which once used to rule over one-third of the world is now reformed as the Britannia Republic. While the world was taking a step towards peace, forces take over the Hokkaido Block of Japan and found the Neo-Britannian Empire. The Japanese are once again oppressed as Elevens. As the Black Knights and local resistance organizations fight to free Hokkaido, the Nameless Mercenaries, brothers Ash and Rozé defeat nobles and Neo-Britannian high-ranking officials to save the Japanese people.

Rozé and Ash take on a mission to rescue Kensei Kuroto, the leader of the Seven Shining Stars.

Rozé and Ash each take a break after the fight against Neo-Britannia.

The Black Knights assist the Seven Shining Stars in freeing Hokkaido; the existence of the Neo-Britannian Sky Fortress Damocles with its weapon of mass destruction F.L.E.I.J.A., causes chaos among the Seven Shining Stars.

A rescue operation is launched to save the Japanese from the Sky Fortress Damocles and F.L.E.I.J.A.

Under Kuroto's command, the Stars, Rozé, and Ash, are forced to make a decision to stop Damocles.