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,. 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. Webas for kaigaku, he was a demon, but fans often wonder whether or not he was an upper moon demon. To answer that question, kaigaku was an upper moon 6. Webi've seen plenty of discussion about why kaigaku was upper moon 6 instead of 5 and the most common answer seemed to be that he wasn't strong enough for number 5. 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. Webkaigaku (獪 (かい) 岳 (がく) , kaigaku?) is a supporting antagonist in the infinity castle arc of demon slayer: He is a demon affiliated with the twelve kizuki,.
