An extension of the summer-arc in the Air TV-series, showing more of what happened during Kanna's, Ryuya's and Uraha's journey to find Kanna's mother.

A short OVA that was bundled with the limited edition of the eleventh volume of the manga.

Daisuke Niwa is a clumsy, block-headed, and wimpy middle school student who has few redeeming qualities. On his 14th birthday, he finally decides to confess his love to his longtime crush Risa Harada, but is rejected. In an unexpected turn of events, however, Daisuke finds himself transforming into Dark Mousy, the infamous phantom thief, whenever his mind is set on Risa. Though Daisuke is unaware of this strange heritage, his mother is certainly not: since before the boy was born, his mother had been planning for him to steal valuable works of art and let the name of the elusive art thief be known. With doubt and confusion constantly clouding his mind, Daisuke finds himself struggling in his relationships with classmates and family. And it is not long before Daisuke realizes that he is not the only one with a fated family legacy—his greatest adversary could be the one classmate he is most unwilling to fight. [Written by MAL Rewrite]

The alien Wulgaru's last assault against humanity was foiled by the heroic actions of the genetically enhanced humans known as the Evolved Children in their advanced AHSMB battle armor, but now a new attack has been launched against Earth under an even deadlier champion, Diorna, created from the fusion of DNA from two Wulgaru Royals. Unfortunately, Izuru Hitachi, the leader of Team Rabbits who defeated the Wulgaru Royal Jiart, is still out of action and recovering, so the task of marshalling the Majestic Princes and stopping Diorna falls upon the unready shoulders of Toshikazu Asagi. Together with the remaining members of Team Rabbits and the recently created Team Fawn, it’s up to Asagi to hold the line against the most ruthless adversary yet.