Aiki Toho Iai
Aiki Toho Iaido is “Iaido using the sword methodology of harmony with energy”. Aiki Toho Iai is a series of kata founded by Shoji Nishio Sensei based directly on Aikido techniques, movements, and principles. When studying Iaido you gain a better understanding of Aikido and when studying Aikido you gain a better understanding of Iaido. Nishio Sensei often says that you cannot truly understand Aikido without studying the sword.
The study and understanding of these kata relates directly to the tai-jitsu (empty hand) techniques of Aikido. You also gain further understanding by practicing the same technique using tachi-sabaki (movement using the sword) and then using jo-sabaki (movement using the jo). Practicing the techniques with the sword, you do not cut your opponent, although the understanding of how to cut your opponent is presented. The choice not to kill, is made available; a path of resolution is to cut in order to lead the opponent, releasing them from harm, and the responsibility of harming.