Arc 4The Demon Doctor’s Alliance
Giyu and Sabito encountered Tamayo and Yushiro in Asakusa, then brought them to Mount Sagiri to cooperate with the Demon Slayer Corps against Muzan. As Kagaya agreed to protect their research, Murata’s squad struggled to survive an attack by demon-controlled beasts.
- Muzan learned that Giyu had survived Kokushibo’s attack and ordered the demons to pause major hunts while Gyokko observed Hachijōjima.
- Giyu defeated Sabito in a sparring match, received a newly forged Nichirin Blade, and joined him in hunting demons across Japan.
- In Asakusa, Giyu and Sabito fought Tamayo and Yushiro, then halted when Giyu sensed that the pair were unlike other demons.
- Tamayo explained her escape from Muzan, revealed what she knew about Yoriichi and the Demon Slayer Mark, and proposed researching Giyu’s unusual blood.
- Giyu invited Tamayo and Yushiro to Mount Sagiri, where Urokodaki welcomed them and helped prepare a room for them.
- Kagaya met Tamayo and Yushiro, agreed to protect and support their research, and asked them to remain on Mount Sagiri until the Hashira could accept them.
- Murata and his squad fought demon-controlled beasts, and their leader cleared a path for the survivors to flee toward the forest’s edge.