The Kashu was a sword that once belonged to the Baroque Works agent Mr. 11. After his loss in a duel with Tashigi of the Marines, she claimed the sword for herself. It is one of the fifty Ryo Wazamono grade swords.
Nothing is known about Kashu's capabilities, aside from it being one of the Ryo Wazamono grade swords.
- Only its blade is seen in the manga. In the anime, the hilt is shown and revealed to be a common round tsuba.
- The sword is the second known grade sword to be claimed by Tashigi and taken from a criminal, the first being Yamaoroshi from Billy the Orca Killer.
One Piece Yellow: Grand Elements (p. 247)