Tamayo & Yushiro: Demon allies aiding demon slayers through scientific research. Tanjiro & Hotaru: Comical relationship between a swordsman and his dedicated swordsmith. Shinobu & Kanao: Hashira ...

Tamayo and Shinobu's collaboration created a drug that weakened Muzan significantly. Shinobu's deep hatred for demons did not deter her from working with Tamayo to develop the drug. The efforts of ...