Kurosawa

is the name of Mifune's sword. The sword is fairly long and thin and had a rectangular hand-guard and long hilt. Mifune has shown great skill and dexterity in wielding the sword, performing Iaidō with the blade. He also used it to slash open Ibuse's head when the salamander swallowed him.

Trivia

 * The name of the sword is probably derived from the name of the famed samurai film director, Akira Kurosawa, who also directed the film Yōjinbō, where Mifune's name also comes from.