True Calendar (TC) 71 new era, when 70% of the population lives in space due to the development of "Dyson Sphere", cities in space. The world is divided into two main powers: the Federation of Military Covenant Dorscia, the Power, which has arisen from the Military Alliance, and the Atlantic Coast of the United States (ARUS), which grew in force as its trade agreements expand. A small nation of Jiorea declared neutrality between the two forces and supports its world thanks to economic prosperity. In the field of Jiore, Haruto Tokishim lived a normal life as a high school student in a division, known as "Module 77", while the Dusian army will not begin his sudden invasion! But the whole world shudders when Haruto will meet the mysterious humanoid weapon, Valvrave!