鯰尾藤四郎

A wakizashi crafted by Awataguchi Yoshimitsu, a swordsmith active during the Kamakura period. He used to be a short naginata but was shortened into a wakizashi. Strong willed, he would sometimes admonishes the Master to prevent him from getting burned this time. He is one of the Toushirou brothers and especially cares for Honebami Toushirou.

(Source: Touken Ranbu Wikia)