Hayden Taylor, a student from Southlight High School living on the sphere's "Module 77", discovers a mysterious and powerful mecha called Valvrave Unit 01 Hito and uses it to defend the module from a Dorssian invasion that takes over the rest of IOR. However, after piloting it Hayden becomes an immortal who requires to feed on others. Once they learn that Dorssia intends to claim the Valvrave for themselves, with no concern with their lives, the students of Southlight High declare Module 77 an independent state and abandon IOR territory. Soon after, several other Valvraves are found inside the school and some of them are claimed by other students who join Hayden's fight to protect it. Once Hayden is approached by L-elf Karlstein, a Dorssian spy who claims to have the intentions to one day stage a revolution in his own country, both join forces in an unlikely alliance to secure the sovereignty of their new-found nation declared and officially recognized as New IOR.
