Demon Yamada 1, later simply Demon Yamada, is a bikaku quinque shaped like a long butcher knife and forged from the kagune of the ghoul Demon Yamada. Rated at the S tier, it earned a reputation for toughness that few weapons in the series could match.
Demon Yamada 1, which the story later shortens to Demon Yamada, is a bikaku-class quinque fielded by the Commission of Counter Ghoul. Its blade takes the shape of a lengthy butcher's knife, and its material comes from the kagune of the ghoul that lends the weapon its name. The bureau places it at the S level.
What sets the weapon apart is its sheer durability. It absorbed strikes from the One-Eyed Owl without shattering, and it held together even against Kaneki as he fought in his kakuja form. That resilience marks it as an unusually sturdy piece among the arms carried by investigators.

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Demon Yamada is the ghoul whose kagune was reworked into the quinque known as Demon Yamada 1, later simply called Demon Yamada, which is wielded by investigator Yukinori Shinohara.
Demon Yamada 1 is an S-rated bikaku-class quinque shaped like a long butcher's knife, fielded by the Commission of Counter Ghoul.
Yukinori Shinohara is the investigator who wields Demon Yamada 1 in the field.
Demon Yamada 1 is known for its sheer durability. It absorbed strikes from the One-Eyed Owl without shattering and held together even against Kaneki while he fought in his kakuja form.
Demon Yamada 1 first appeared in Chapter 73 of the manga and Episode 13 of the anime.
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