After rescuing Tanjiro who was swallowed by one of the tree dragons, Mitsuri now faces off against Zohakuten in order to save Nezuko and Genya. Mitsuri skillfully fends off the fierce attacks from the tree dragons, but she is struck with a powerful attack from Zohakuten and loses consciousness right before she is able to land a decisive blow. As a killer blow is about to strike down on her, Mitsuri recalls a memory of her past self and her special constitution...