Arigawa is just an ordinary Japanese teenager, who attends an ordinary Japanese high school. At least he was ordinary until he met Mimi, the charming new exchange student. One day, being a perfect gentleman, Arigawa walked her home after the school, but was attacked by angry female martial artists. Mimi reveals to him that she has studied esoteric martial skills by a man known simply as "The Teacher". Unfortunately, not every one who knows these secret techniques uses them for the good. The young hero gets involved in a conflict from which there is no escape...