Webboth kaigaku and zenitsu were faced with stronger enemies and the choice of becoming a demon, but whereas zenitsu didn't give up and kept on fighting even though he was. Webkaigaku seemed to hate zenitsu and thought of him as unworthy to be taught by a former hashira, since he was always crying and was only able to master one thunder breathing form. However, despite kaigaku mistreating zenitsu and telling him to quit, the. Webkaigaku is one of the supporting antagonists in the infinity castle arc in demon slayer. Originally, kaigaku was a demon slayer who was a disciple under the. Webzenitsu agatsuma vs kaigaku is a battle that took place in the infinity castle. It focuses on the battle between demon slayer zenitsu agatsuma against upper rank six kaigaku. With a true member of the twelve kizuki present on mount natagumo, tanjiro realizes it must possess a higher concentration of muzan 's blood, reaffirming his goal to extract. Websince kaigaku is on of the 9 children gyomei took care of as a monk before becoming demon slayer, who also bears quite a grudge against kaigaku who brought tragedy on. Webit appeared at face value that gyomei murdered the children, and he was jailed as a result, set for execution. Luckily for him, a young master ubuyashiki saved him from. Webhowever, kaigaku’s true nature is revealed when he cowers in fear before kokushibou, willingly accepts muzan kibutsuji’s blood, and becomes a demon.
