Three specials released with DVD volume 9 of the TV series. Episode 1: The Day of Gathering 
Past event about Chalce and Chrome's group, of how the three youngest members came to join them. Episode 2: White Footmarks 
Past event about Chalce transfer into Cluster E.A, his meeting with Hema and how he elicted the hatred from the competitive Vesuvia. Episode 3: Wings of Freedom	 
A strange girl appears in Cluster E A, looking for Fon. Is she there for a visit or something else? Will she find her answer amongst Fon and his friends? 
(Source: Wikipedia)

CLUSTER EDGE: Secret Episode