A girl passing as a boy, fourteen-year-old Kira is left to fend for herself alone in this world. During a crucial turning point in her life, she makes a pact with a mystical entity in return for a male voice; this grants her to step into a bigger world by becoming a servant to a grand noble. From a commoner to a page boy, to a knight that leads others to battle, Kira matures through enduring agony and education. However, she's a mere pawn, an expendable being in the chess match between powerful men without any control over her own destiny. With no one to count on, can our heroine be able to change the fate others have chosen for her?