Webkaigaku (獪岳 kaigaku) was a former demon slayer and uses the breath of thunder in the kimetsu no yaiba (demon slayer) series. After becoming a demon he replaced daki. As warabihime, her pupils are triangular and sharp, making it very obvious to the audience that she's a demon. Webin a move to save himself, kaigaku swiftly surrendered, leading to his transformation into a demon and subsequent elevation to upper rank six within the twelve kizuki. Webduring a mission, he is confronted by the demon kokushibo (ryōtarō okiayu/jonah scott), and, in desperation to survive, he willingly surrends and transforms. Webcan the idea of sinning against god — and not only in a moment but for one’s whole lifetime — not merit eternal damnation when one sin justly plunged the world into. Webhell, we are told, is the place of eternal, conscious torment where sinners experience just punishment for their sins. But what if we’re wrong? Recent scholarship has resurfaced. Webkaigaku’s character development primarily focuses on his descent into villainy as he becomes a demon and his rivalry with zenitsu. His decisions are driven by. Webkaigaku's betrayal led to gyomei's imprisonment and jigoro kuwajima's death, fueling zenitsu's rivalry. Kaigaku became upper rank six of the twelve kizuki,. 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.