Zenitsu Agatsuma

A coward who finds his courage in the face of betrayal.

Zenitsu Agatsuma is a Demon Slayer and one of Tanjiro Kamado's companions. He faces his former senior Kaigaku, who became the new Upper Rank Six after an encounter with Upper Rank One Kokushibo. Angered by Kaigaku's lack of guilt over his betrayal—which led to their master Jigoro committing seppuku—Zenitsu battles him. Kaigaku voices his frustration at being compared to Zenitsu, but is killed when Zenitsu uses a self-taught Thunder Breathing form. After the fight, Zenitsu passes out and momentarily enters the afterlife, where Jigoro reaffirms he has always been proud of him; he is then rescued by a disguised Yushiro, who has been using his Blood Demon Art to help the Ubuyashikis map the Infinity Castle.