NODA, JAPAN - MAY 21: Japanese swords are displayed inside the Bujinkan dojo on May 21, 2017 in Noda, Japan. The Bujinkan is a martial arts organization headed by Grandmaster Masaaki Hatsumi. The organization is most commonly associated with ninjutsu, a martial arts training for Ninja. Their training led by Hatsumi, who succeeds to nine martial arts ryuha, or schools, including Togakushi-ryu ninjutsu, which is generally referred to as taijutsu, or body arts, and is composed of both armed and unarmed methods of fighting. (Photo by Tomohiro Ohsumi/Getty Images)