Lady Kazumi was the wife of Lord Mifune for several years. Due to the intrigues of Lord Hikiji, a force of Neko Ninja infiltrated the Mifune castle to kill Lord Mifune, Lady Kazumi and Prince Tsuruichi. Lord Mifune slew his would-be assassins with the help of Miyamoto Usagi and Gunichi. However, Lady Kazumi and Prince Tsuruichi were killed. As a result of their deaths, Lord Mifune declared war on Lord Hikiji, which resulted in the Battle of Adachigahara.