Episode 15 of Drifters shipped with the special version of the manga's sixth volume.

Four psychic teenagers—Mia Alice, Roll Kran, Lamba Nom and Pai Thunder—are brainwashed by the scientist Dr. Tarsan as pilots of his greatest experiment—the giant robot Dangaioh. But as their memories slowly return, these pilots use their abilities and Dangaioh to combat the tyranny of Captain Galimos and the Bunker Space Pirates.

Grey is a laconic trooper in a rough, futuristic military system which rewards success in battle with high pay and promotions, but only three precent of troopers live long enough for the final goal - citizenship and the chance for a life above the misery of most of the populace. Grey has managed to keep coming back alive, even earning the nickname Grey Death. But is the society he's fought for worth it?