Kaigaku is a supporting antagonist in the Infinity Castle Arc of Demon Slayer: Kimetsu no Yaiba. He is a demon affiliated with the Twelve Kizuki, holding the position of Upper-Rank Six, replacing Daki and Gyutaro after their deaths.
Kaigaku was a former Demon Slayer and Zenitsu Agatsuma's senior disciple under the former Thunder Hashira, Jigoro Kuwajima. However, sometime during Hashira Training, Kaigaku went on a mission and encountered Upper-Rank One, Kokushibo, quickly surrendering to him to save his skin and later becoming a member of the Twelve Kizuki.
Kaigaku was an orphan and a thief who had to eat scraps and steal to survive. He was one of the orphans Gyomei Himejima cared for at his temple, where he was shown to be chipper in their company. However, after he was caught by the other children for stealing temple money, he was chased out at night and encountered a demon, which he then let into the temple in exchange for having his life spared. He did so by extinguishing the wisteria incense meant to ward demons off and running off when the deed was done.
Kaigaku developed the belief that strength and survival were the only things worth respecting and was willing to grovel and beg for his life if it was what it took to survive. Eventually, he was taken in by Jigoro along with Zenitsu, learning Thunder Breathing. He became determined to become Jigoro's successor and the new Thunder Hashira. Jigoro, however, insisted that both he and Zenitsu would become his successors, despite Zenitsu's weakness and timid nature.
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