Years have past since the coming of the MECHAs (an extra terrestrial robotic lifeforms) and Earth have finally been able to defend themselves against these invaders with weapons made from Sentinalium. Now Earth trains its youth to be able to confront these MECHAs. Among those students is the heir to one of the most recognised families since the war, the Bakuhashi family, Kazuro Bakuhashi. The Bakuhashi family's reputation exceeds them as being capable of using any weapons imaginable, Kazuro, however, is unable to even know the difference between the barrel and the trigger. Determined to prove his birthright, Kazuro is sent to an Academy with a secret identity and a box passed down from generation to generation in the main family. With friends from other high-up families and an old acquaintance, what more can you ask? Well.... Now as he face the challenges, little that he knows that a box full of painting is enough to see the bigger picture.