Webmanga readers know that it detailed kaigaku's transformation into a demon and his master's death as a result. Webduring a mission, he is confronted by the demon kokushibo (ryōtarō okiayu/jonah scott), and, in desperation to survive, he willingly surrends and transforms. 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. 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. Webkaigaku, once a skilled warrior and trusted ally, was unexpectedly transformed into a demon. This puzzling turn of events has left many wondering who. Webfaced with the threat to his life, kaigaku chose to surrender, expecting to be killed. However, kokushibo spared him and, instead, turned kaigaku into a demon. Webby succumbing to the demon’s blood, kaigaku not only betrays his fellow demon slayers, but also his own humanity. Struck by tragedy and consumed by darkness, kaigaku chose to abandon his humanity and embrace the demonic curse. Webhe became a demon mainly because he didn't wanna die due to the mark. He also didn't regret his decision until he saw his mutated spidery form during the final fight.
