Since the ancient times, a wall is what protected Humanity from Demonspawn; a blessing granted by two peculiar Gods. However, living is hard, as resources are limited and humanity is forced to look forward to the unknowns of the world. Deio, a confident graduate of the Emorian System who wants to be the Top Warrior of his people, is faced with the anguish inflicted by the evils of the world. A simple resources assignment heralds the end of his walled-in life, as destiny was already looking his way.
Deio Senwa, 15, is a young man who, alongside his teammates Yui and Suti, have been in the Military's training program for nearly 10 years now, with aspirations to be in the Warriors Class. They have one final exam that they must take; fending off a real-life Demon! If they are to walk a path of life-risking battles against countless amounts of these creatures, they must take their first step..
Deio, Yui, and Suti are approached the Admiral himself, only to surprisingly tell the Unit that he won't pass them. The Unit is given a second chance, but it stands to reason that they are no more ready for the second chance than they were the first.
Walked home by Deio, Yui runs into her younger brother on the way in. What was just supposed to be a passing remark turns into a conversation that Yui needed to have more than she realized.
Roni is summoned back to the Admiral's office to speak with his former captain about his recruits first exam, much to his former captains dismay.
Preparing to work his teammates to the bone, Suti has another altercation with his stepfather Jiku. What will become of Suti's motivation to assure his teammates success?