An especially devastating offensive combination attack in the Kyotouryuu fighting style.
Shichika Hachiretsu combines seven attacks into one combination that rips the opponent apart in an instant:
The moves are executed at an incredibly high speed as demonstrated when Shichika completed the combo in less time than it took for a sword to drop to the ground from about 20-30 feet in the air. This combination attack was first used in Episode 1 of Katanagatari, "Plane, the Absolute", by Shichika Yasuri against Koumori Maniwa, who was impersonating Shichika at the time.
In episode 4, Nanami notes that there is a weakness to the move and in episode 7 she demonstrates this and exposes an opening in Ryuuyoku Kakou that leaves the attacker completely open for counterattack.