Webshinobu kocho finally encounters doma, the upper moon two, who had killed her beloved sister kanae in the past. Webshinobu's grand plan is the wisteria poison− she infused the poison into her body as the final attempt to kill him fails. After shinobu took a lethal blow from doma, the. Fan favorite character shinobu kocho has an incredibly tragic and untimely death in demon slayer’s penultimate arc. The insect hashira goes after. Webshinobu’s family has been killed by demons, especially her beloved sister, kanae kocho, whose life was also taken by the demons, which casts a heavy shadow. Webshinobu kochō does indeed die in demon slayer: Her death happens during the infinity castle arc, in chapter 143 of the manga, when she is. Webdemon slayer season 4 reveals shinobu has a plan to defeat the demon who killed kanae. But, what is her strategy, and does it work?