| abstract | - Demon Yamada 1 (オニヤマダ壱, Oni Yamada Ichi), later Demon Yamada (オニヤマダ, Oni Yamada), is a Bikaku Quinque that takes the form of a long butcher knife. It is made from Demon Yamada's Kagune. It is a very strong Quinque, being able to resist blows of the One Eyed Owl and Kaneki using his Kakuja without collapsing.
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