|Japanese Air Date||
April 7, 2017
← OVA 2
This episode was originally bundled with Volume 10 of the manga.
Taking place immediately after the prologue scene from Episode 1, a squad of US marines amuse themselves with their objective's apparent immortality. One in particular, codenamed Fox, seems particularly interested in the possibilities of having such an ability, such as being able to stage terrorist attacks without having to die as if it were a game. During the debriefing, the squad's CO reminds them of the secrecy of their mission, though it is already spreading that such people would be called demi-humans.
Prior to their next mission to capture an African warlord alive, Fox considers killing himself to find out whether he is immortal but backs out at the last moment. That night, the squad silently infiltrates the enemy compound and captures the warlord unharmed. However, Fox declares himself to be bored, and fires two shots which alerts the enemy to "start the game". Fox eliminates the enemy and is about to kill their captive when he is knocked out by a fellow marine. Fox's actions leads to his dishonorable discharge from the military. Sometime later, Fox (now going by Satou) discovers he is indeed immortal after killing unknown assailants.
In a post credits scene, Satou watches a leaked video of scientists "experimenting" on Tanaka, and prepares to rescue him.