A small group of pupils trains in secret at the famed Hanzo Academy to become ninjas of the Shinobi Masters, an elite clan of ninjas. Following in her grandfather's footsteps, Asuka goes through this hard training with her unique circle of friends: Ikaruga, Katsuragi, Yagyuu, and Hibari. They work tirelessly to improve their talents in the hidden ninja techniques in the hopes of one day becoming full-fledged female ninjas.