After Zenitsu beheads Kaigaku by performing the Thunder Breathing: Seventh Form - Honoikazuchi no Kami, both fall in the Infinity Castle to their deaths. Zenitsu plummets unconsciously as the disintegrating Kaigaku grows furious at his defeat from Zenitsu's hands. He comforts himself with the idea that Zenitsu will die with him when they hit the floor until Yushiro comes to save Zenitsu, while coldly reminding Kaigaku that without friends he will end with nothing since he gave nothing to anyone.
Zenitsu awakens in a land full of Red Spider Lilies and sees his master Jigoro Kuwajima across a river that separates the two. Zenitsu breaks down in front of him crying in remorse and regret for not being able to save Kaigaku and being unable to become a Hashira prior to his death. As Zenitsu struggles with being caught with the lilies, he realizes that Jigoro hasn't said anything to him. Jigoro breaks his silence by calling out Zenitsu's name and with tearful eyes he proclaims that Zenitsu is his pride and joy.
In reality, Zenitsu is being patched up by Yushiro while being guarded by Murata and another Demon Slayer.