My Nemesis is Prime Ranger... and a Girl

Mecha prodigy Rin disguises herself as a boy to enter an all-male military academy, only to end up as the arrogant marshal's son Damien's roommate and personal servant. From bitter rivals to saving each other's lives—a wrapped chest, a near-exposed physical exam, and fighting side by side in battle—her secret and their growing spark threaten to ignite at any moment.