A tantou forged by Awataguchi Yoshimitsu. One of the Toushirou brothers. For samurai families, a Yoshimitsu tantou was a gift of the highest order. If it was one that had even briefly been in the possession of Tokugawa Ieyasu, its significance is further enhanced. And it goes without saying from whom he inherited his tastes.

A tachi by Awataguchi Yoshimitsu, known as a master of tantou forging. Its name means he made only one in his lifetime. He is affectionately called "Ichi-nii" by the Toushirou brothers as their eldest brother. He is always a gentle and calm person with a smile, but a hint of sadness can sometimes be glimpsed in his expression.