Webdemon slayer chapter 144 confirms what was said in zenitsu’s letter as he speaks to kaigaku in a heated discussion. The message indicates that jigoro kuwajima,. Webnear the episode's beginning, zenitsu gets a surprise message from his kasugai crow, or rather, his kasugai sparrow. Anime fans can't see what the message. Webin this letter is a notice that zenitsu’s instructor, jigoro kuwajima, has killed himself through seppuku to atone for the acts of one of his students. Webthe chapter shows zenitsu confronting kaigaku, who became a demon. Zenitsu, who was often cowardly, changed after learning of the way kuwajima died. Webzenitsu’s fury and agitation were on full display in episode 7 of demon slayer season 4 as he read the letter, causing concern for tanjiro. Webas revealed in demon slayer chapter 144, titled successors, zenitsu’s letter brought him news about the sudden death of his master and former thunder. Webzenitsu agatsuma, the blonde swordsman with a surprising secret, is a fan favorite in the world of demon slayer. But what truly sets him apart from his fellow. Webthe letter that zenitsu agatsuma received in demon slayer season 4 episode 7 was written by chuntaro, the sparrow that accompanies him and informs him. Webduring the hashira training arc, a bird brings zenitsu a letter explaining what happened, and shortly after we see him being all serious. Though if i remember correctly it's not.