Classical Japanese martial arts are ancient techniques that developed to help samurai warriors survive on the battlefield. In this week's special feature, our presenter Ayako Kisa visits the Onoha Itto-ryu school of swordsmanship, a school that has produced many distinguished swordsmen. Takemi Sasamori, the 17th head, takes us deeper in to the school's philosophy, as we explore the complexity of these fascinating disciplines.