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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-type 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.