About The Arc
During the Demon Slayer: Kimetsu no Yaiba Rehabilitation Training Arc, Tanjiro faces a trial before the Hashira for protecting his demon sister, Nezuko. βNezuko refuses despite her injuries and proves she won't harm humans.β, as noted by Demon Slayer Wiki. Afterward, Tanjiro, Zenitsu, and Inosuke recover at the Butterfly Mansion and undergo brutal physical and reflex conditioning under Aoi and Kanao to master Total Concentration Breathing constantly
The Hashira Trial
Tanjiro is put on trial by the elite Hashira for breaking corps rules by protecting his sister, Nezuko. Sanemi Shinazugawa wounds Nezuko with his blood to prove she will attack humans, but she resists and refuses to feed.
The Verdict
The leader of the corps, Kagaya Ubuyashiki, officially permits the Kamado siblings to travel together.
The Butterfly Mansion
Tanjiro, Zenitsu, and Inosuke are sent to recover from their severe injuries under Shinobu Kocho.
Physical Therapy: Aoi Kanzaki and the
triplet girls put the boys through intense muscle-stretching and flexibility drills.
Reflex Training
They play full-body tag and reflex tests against Kanao Tsuyuri, which initially demoralize Zenitsu and Inosuke into quitting.