Short promotional animation clip was released as part of a special Comic Blade Digital DVD sold at Animate. 
Based on a manga "Erementar Gerad: Aozora no Senki" by Azuma Mayumi serialised in Comic Blade Masamune and later in Comic Blade Avarus starting on September 15, 2007. It is a spin-off of the mangaka's earlier series Elemental Gelade.

A harsh winter falls on Fuajarl, the Kingdom of the Sun, when a fierce attack staged by Edel Garden leaves the once prosperous nation kingless and in ruin. Faced with an uncertain future and an impending execution, Fuajarl's heir and Princess, Achea, must gather the last of her comrades and reclaim the kingdom her father once ruled. Mangaka Mayumi Azuma returns to take readers on another adventure in Erementar Gerade: Flag of Bluesky!
 
(Source: Digital Manga Publishing)
 This story takes place two years after Erementar Gerad.

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