Shichika Yasuri is a fictional character from the light novel series Katanagatari, written by Nisio Isin. He is the last practitioner of the Shichika style of swordsmanship, which emphasizes using the body as a weapon rather than traditional swords. Set in Japan during the Edo period, the story follows his journey to collect twelve legendary swords. Accompanied by Nikaido, a strategist and his partner, Shichika faces various opponents who possess unique abilities. The narrative explores themes of philosophy, combat, and the nature of strength, while highlighting the relationship between Shichika and Nikaido as they navigate challenges together.