Spoiler-Safe Summary

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After recovering from injuries, Tanjiro, Zenitsu, and Inosuke begin intense rehabilitation training under the guidance of the Insect Hashira to prepare for future battles.

Full Plot Summary

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After recovering, Tanjiro, Zenitsu, and Inosuke partake in Rehabilitation Training, involving three unusual challenges. Zenitsu and Inosuke soon quit when they cannot progress. The girls of the Butterfly Mansion; Sumi, Kiyo, and Naho, inform Tanjiro of a different technique called Total Concentration Constant. He undergoes his own training to learn it. When he meets Shinobu, she commends him for his spirit, and later reveals her reason to hate demons, as her elder sister was killed by one. Hearing her trust in him, Tanjiro remembers the pain of his family's death and his promise to Nezuko.