From Seven Seas:
Extra-dimensional beings known as the Nova have invaded our garden world, hellbent on wiping humanity off the face of the planet. The only hope is a specialized force of genetically engineered female Pandora and their male partners known as Limiters, who represent the last line of defense against a monstrous foe. Kazuya Aoi is a teenage Limiter who enrolls in the prestigious West Genetics Academy.
Having made a promise to his fallen Pandora sister, Kazuya must overcome his grief and become the best he can be. Enter second-year student Satellizer el Bridget, a frigidly beautiful and ruthless Pandora who has never lost a battle simulation. Can Kazuya pierce through her icy exterior and win her trust? More importantly, can he ready himself for an impending war?