Triplets. Their model numbers are CCS-LEG-Se-01208, CCS-LEG-Se-01209 and CCS-LEG-Se-01210.

Cluster Edge Academy isn't just any school; it's THE school, where the offspring of the elite come together to prepare for their roles running a world where artificial soldiers and religious sects are major factors in the battle for total control. Which may be part of why new transfer student Agate Fluorite doesn't quite seem to fit in. It's not just that Agate's enthusiastic attitude stands out among the somber, brooding balance of the student body. There's something about him that demands notice, even from jaded honors students like Beryl Jasper, and from the moment of arrival he's been at the center of a series of mysteries that not even Agate understands. Because Agate's not just another student, he's part of a something so momentous, and dangerous, that the world that built Cluster Edge may not survive its passing. 
(Source: Sentai Filmworks)

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 Academy isn't just any school; it's THE school, where the offspring of the elite come together to prepare for their roles running a world where artificial soldiers and religious sects are major factors in the battle for total control. Which may be part of why new transfer student Agate Fluorite doesn't quite seem to fit in. It's not just that Agate's enthusiastic attitude stands out among the somber, brooding balance of the student body. There's something about him that demands notice, even from jaded honors students like Beryl Jasper, and from the moment of arrival he's been at the center of a series of mysteries that not even Agate understands. Because Agate's not just another student, he's part of a something so momentous, and dangerous, that the world that built Cluster Edge may not survive its passing.
 
(Source: Sentai Filmworks)

Sepia (Chrome Team)