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Get out of here... You gonna make me repeat myself?, leave my sight. You know why. The way you cry like a baby all day long. Aren't you ashamed of yourself?.. Good for nothing, any effort spent on you is an absolute waste of time. Our teacher is an extraordinary man. [..] Hey you, don't go being all familiar and calling him gramps! He's a former Hashira, someone who earned the highest tile in the Demon Slayer Corps. Hardly anyone ever gets the chance to be trained by a former Hashira. The time he spends training you is all for nothing its infuriating to see! I hate even looking at you so get out! Why are you even here? Why do you insist on clinging on like a patch of mold?!
~ Kaigaku berating Zenitsu in the past.
I know what right and wrong is! Those who appreciate my talent is the right, those who don't and denounce me is the wrong!
~ Kaigaku revealing his values.

Kaigaku (In Japanese: 獪岳, Kaigaku) is a supporting antagonist in the action dark fantasy series, Demon Slayer: Kimetsu no Yaiba. He served as one of the two secondary antagonists (alongside Nakime) of the Infinity Castle arc.

He was a former member of the Demon Slayer Corps, a senior to Zenitsu Agatsuma, and a disciple of Jigoro Kuwajima, the former Thunder Hashira. He later betrayed the corps after encountering the Upper One of the Twelve Kizuki, Kokushibo, becoming a demon to protect his own hide and quickly becoming the new Upper Six demon. Due to his betrayal, he quickly became the arch-enemy of Zenitsu.

He is voiced by Yoshimasa Hosoya in the Japanese version of the anime and by Alejandro Saab in the English version.

What Make Him Hate Sink?[]

  • He was an orphan, and when Gyomei Himejima was a monk, he lived under him like other orphans and as a family, but he was a kleptic and stole money from the temple.
  • On the night that he was expelled from the children of the temple for stealing the temple's money, he extinguished the Wisteria incense near the temple and made him live with the demon, causing the demons to kill the other clan of Gyomei. Also because of this, Gyomei was mistaken for a child killer and sent to prison, which caused Gyomei to discredit children.
  • Immediately after being accepted as a disciple to Jigoro Kuwajima, he bullied Zenitsu Agatsuma, believing that he was nothing more than a coward who had won the favor of his master through absurd luck, which can be seen as an hypocritical act of him, since he's a coward himself.
  • Later, in the Dimensional Infinite Fortress episode, He appeared as a demon in front of Zenitsu, surrendered to Kokushibou in order to survive, and became a demon by taking blood, which caused his mentor Jigoro Kuwajima to commit suicide out of shame.
    • While one could understand that Kokushibo was too powerful and would've killed him, that still doesn't justify Kaigaku's betrayal.
  • He provoked Zenitsu's anger by mocking Jigoro's death, showing that Kaigaku had no regrets for causing his master's death.
  • He was beheaded by Zenitsu, who created a new form called Seventh Form: Honoikazuchi no Kami, but he still had no regrets about his evil deeds, and he still denies that Zenitsu has overtaken him, and he died miserably.
  • He is the only human with a rotten personality among the Demon Slayers. He only fails to the heinous standards, but his personality is nearly as rotten as Muzan Kibutsuji's.

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Hantengu | Gyokko | Kaigaku | Snake Demon | Doma's Father

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