Hiten Mitsurugi-ryū (飛天御剣流, Flying Heaven Govern Sword-Style) is an ancient kenjutsu style from the Sengoku Jidai, developed to allow a single samurai to defeat numerous foes single-handedly created by Hiko Seijūrō I. Rooted in the concept of ichi no tachi, or to strike in a single blow, practitioners of this style use a combination of immense speed and agility, battōjutsu, and acquired, observation-based pseudo-clairvoyance that permits a practitioner to anticipate an opponent's movements. Both offensive and defensive maneuvers are executed with minimal movement to increase a practitioner's ability to counter-attack and to conserve energy.