Erementar Gerad: Aozora no Senki

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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.

(Source: AniDB)