A research laboratory in the international city Kanazawa. Kei Sagami, daughter of the chief of laboratory, Professor Hiromitsu Sagami, becomes a witness of an experiment - the awakening of a sword, the Maken. It's able to heal mental disorders, at least according to her father. But as strange foreigners forcibly break into the laboratory, kidnap her father and put the actual carrier of the sword out of action, she experiences the true meaning of the Maken first hand.