Arc 4The Thunder Hashira
Sasuke killed Rui, earned the Hashira’s recognition by defeating the Information Demon with Kirin, and was formally named the Thunder Hashira. At the Butterfly Mansion, he trained Tanjiro and Inosuke, noticed Zenitsu’s hidden talent, and agreed to work with Shinobu on a poison capable of killing Muzan, on his own terms.
- Sasuke killed Rui, and the Master ordered Tanjiro, Nezuko, and Sasuke escorted to headquarters, where Sasuke defended Nezuko before the Hashira and Kagaya named him a Hashira-level Candidate.
- Sasuke accepted a mission to find the Information Demon in the City of Wind Chimes and traced its network of altered messages to the Wind Chime House.
- Sasuke overwhelmed the Information Demon with Chidori Stream, then summoned Kirin from the storm clouds and annihilated it.
- After the Hashira heard reports of Kirin, Kagaya formally named Sasuke the Thunder Hashira, and Sasuke visited Jigoro Kuwajima to tell him he had inherited the position.
- At the Butterfly Mansion, Sasuke demonstrated how Tanjiro could improve his Constant Flux and defeated Inosuke by outmaneuvering him.
- Sasuke used his Sharingan to discover that Zenitsu unconsciously maintained Total Concentration: Constant and recognized his natural affinity for lightning.
- Shinobu found that Sasuke’s body could contain immense energy and poison, and proposed developing a toxin to kill Muzan.
- Sasuke used genjutsu to make Kanao question her reliance on her coin, then agreed to Shinobu’s poison plan on condition that she share all her research and the complete formula.