In the future, Earth is split into three factions: Dorssia, an empire bent on world domination; ARSUS, a military alliance; and Jiro, a collection of neutral states with colonies across the galaxy. On one such colony, Haruto Tokishima lives a carefree life at Sakimori High, where his greatest concern is mustering the courage to confess to his childhood friend, Shouko. His idyllic life is broken, however, when a team of Dorssian super-soldiers, led by the enigmatic L-elf, assaults the colony to retrieve the 'Valvrave', a mobile suit secretly being constructed there. In the resulting chaos, Haruto watches as Shouko disappears within a laser’s blast; enraged, he climbs into the now accessible Valvrave, and defeats the Dorssian army after forsaking his humanity to the machine. Haruto pledges to protect the colony, but can he come to terms with what he's given up to gain such power?