1 الموسم
12 حلقة
ガンパレード・マーチ -新たなる行軍歌- - Season 1 Episode 1 الحلقة 1
A "Brain" is discovered in a region of Japan and an disposal mission is ordered. It ended in a huge massacre. A new elite unit is then called to deal with this threat. It's the unit "5121", consisting of young men and women. A new mysterious rookie also happens to lend a helping hand.