Shichika Yasuri is the main protagonist of the anime series 'Katanagatari'. He is the seventh head of the Kyotouryuu school of Japanese sword martial arts, known for fighting without a sword. Raised in isolation on the island of Fushou, Shichika is initially naive and straightforward, but grows as he travels with Togame on a quest to collect the Deviant Blades. His unique personality and fighting style make him a pivotal figure in the series' dramatic narrative.