A giant Fūma shuriken that has become something of a trademark for the tall kunoichi. This particular model however is excessively large, resembling four wide Zanbatō blades around a central ring with a handle going through the hole. The weapon has a pull cord that can be used to make the blades spin around the ring, blocking ranged attacks and chopping up anything unfortunate enough to get in its path. Kaede is able to conceal the weapon by folding the blades together and stowing it on her back.
In the manga, it's a normal weapon that Kaede uses when she fights Kotarou. In the first anime, it serves as her Pactio artifact.