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.
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.
Webzenistu receives a letter from chuntaro, his sparrow assigned to him for assignments and correspondences within the demon slayer organization.
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,.
Webdemon slayer hashira training arc episode 7 opens with zenitsu’s kasugai crow (sparrow), chuntaro, carrying a letter.
The scene then shifts to where the previous.
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.
Webzenitsu agatsuma, the blonde swordsman known for his flashy techniques and sleepy demeanor, faces a new challenge in demon slayer season 4 episode 7.
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,.