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. The letter that zenitsu received carried the news of the death of his master, the former thunder hashira jigoro kuwajima. He committed seppuku, a ritualistic suicide in japan, to atone for. Webwhat many fans didn’t notice is that the kid who betrayed them was the senior apprentice studying alongside zenitsu agatsuma, the other disciple under trainer and. 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 hashira,.
