Kaigaku's Demonic Transformation: From Ninja To Shadow Beast

Webmanga readers know that it detailed kaigaku's transformation into a demon and his master's death as a result.

Webkaigaku, once a skilled warrior and trusted ally, was unexpectedly transformed into a demon.

Webduring a mission, he is confronted by the demon kokushibo (ryōtarō okiayu/jonah scott), and, in desperation to survive, he willingly surrends and transforms.

Webhe became a demon mainly because he didn't wanna die due to the mark.

Webby succumbing to the demon’s blood, kaigaku not only betrays his fellow demon slayers, but also his own humanity.

Webfaced with the threat to his life, kaigaku chose to surrender, expecting to be killed.

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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.

He also didn't regret his decision until he saw his mutated spidery form during the final fight.

Webkaigaku is one of the supporting antagonists in the infinity castle arc in demon slayer.