Websimply put, zenitsu’s grandfather and master, jigoro kuwajima, ended his life after one of his former apprentices became a demon. Chapter 144 of the demon. 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. Webthis change stemmed from a devastating revelation delivered by his sparrow, chuntaro. The letter conveyed the news that zenitsu’s former master, jigoro. 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 letter that zenitsu agatsuma received in demon slayer season 4 episode 7 was written by chuntaro, the sparrow that accompanies him and informs him about the. 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.
