What If Shinobu Took In Tanjiro and Nezuko (Part 2)

Shinobu Kocho poisoned herself to kill an Upper Moon demon, and survived at a cost that would not let her live long — but her students brought her home anyway. After the Hashira meeting, Shinobu begins training Kanao to finish what she cannot: beheading Upper Moon Two after the wisteria poison does its work. Kanao discovers that the poison is killing Shinobu from the inside, even as Tanjiro and the others rotate through brutal Hashira training stations across the Corps. When the fight comes, Shinobu lets the demon devour her to deliver a lethal dose, and Kanao takes his head with Inosuke's help. The battle costs Shinobu an arm and leaves the poison permanent in her blood. The war ends with Muzan's death and heavy losses, including multiple Hashira. Shinobu returns to the Butterfly Mansion with limited time, and Kanao stays beside her — no longer as a student, but as the younger sister Shinobu finally names her.