The war with the Nightfly O'Notes is not yet over, but having lost their friends, the grieving Akira, Yosuke, and other Scar-red Riders have a difficult time navigating the healing process to get back on their feet.

A new foe appears before Akira and the Scar-red Riders. Despite the shock of seeing this new foe, the group returns to Ryukyu LAG to mount a last-ditch effort. While Akira is getting ready, a familiar face shows up.

With the red moon shining overhead, the end of the world begins. As the Scar-red Riders take to the battlefield, Yosuke and Takt face off, and Akira realizes the reasons why they have all been fighting for so long.