Special episode included in the second Blu-ray/DVD volume.

Ten years ago, a massive invasion by the Erebonian Empire almost shattered the Kingdom of Liberl, piercing to the heart of Capital City before being driven back by a determined counteroffensive led by Cassius Bright. Now, as the invaders pace behind the northern borders, coveting the small kingdom's magic and high technology, Liberl slowly rebuilds with the aid of the Bracer's Guild, whose mystical use of Craft is even more intrinsic to the nation's defense than its own army. For young Estelle Bright, daughter of Cassius, this is all just ancient history that she and her adopted brother Joshua learned as kids. But history has a way of repeating itself, and as they prepare to join the Bracers Guild themselves, sinister forces are preparing to thrust them into the familiar family situation of being in the worst possible place when mayhem breaks out. Because when their father's airship goes suddenly missing, of course it only makes sense to two green, but extraordinarily capable, young teenagers to strike out on a rescue mission of their own! (Source: Sentai Filmworks)

Kanon spin-off OVA bundled with vol. 22 of the Kami nomi zo Shiru Sekai manga. (Source: Weekly Shonen Sunday)

In an alternate 21st century, the robotics industry undergoes a period of rapid advancement worldwide. By the year 2050, Japan has firmly established itself as the leader in robotic technology and manufacture with Daiwa Heavy Industries. As the technology evolves to include robotic enhancements to the human body, the blurring of the line between man and machine triggers a sudden shift in world opinion. In response, the U.N. passes a unilateral ban of further research and development on robotics in 2067. Japan fiercely objects to this ban, but is unable to prevent its passage. In protest, Japan withdrew from international politics and chose to pursue a policy of high-tech national isolation. While only trade continues, Japan disappears from the world scene. Ten years later, a series of bizarre incidents lead the American technology police agency SWORD to believe that Japan has concealed extensive development of banned technologies through the use of the RACE network. SWORD dispatches a unit of special agents to infiltrate Japan and gather intelligence on the country. Vexille, a veteran agent among the group, uncovers the horrifying truth behind the ten years of isolation.