Sawa continues her double life as an unassuming college student while carrying out precise acts of retribution against those who have escaped the law. Trained in secret by the detective who took her in after her family's tragedy, she strikes with skill and resolve, always mindful of remaining unnoticed. Yet the pull of her sole confidant, another fighter for justice, grows stronger with each mission, forcing her to weigh her loyalty to her guardian against the trust they share.