Benigasumi

Benigasumi was Yūra's wakizashi which she used for close ranged combat. She had said it was a treasure among the oni because it had the ability to cut through flesh and bone, but not her specialized hair. She used it to decapitate her victims, but otherwise controlled it with unseen strands of hair.

Trivia

 * Benigasumi literally translates to 'red haze'.