You Must Master a Single Thing (ひとつのことを極め抜け, Hitotsu no Koto o Kiwamenuke) is the 17th episode in the Kimetsu no Yaiba anime TV series.



One of the Twelve Kizuki, a direct subordinate of Muzan Kibutsuji, is here somewhere. When Tanjiro slays the Mother Spider Demon of Mt. Natagumo, he learns that a demon who might hold the key to turning Nezuko back into a human is somewhere in this very forest. With the battered Inosuke in tow, he heads deeper into the forest. Meanwhile, Zenitsu trudges forlornly through the woods only to encounter a spider with a human face.

Anime Notes

  • This episode has a translation error that states thunder breathing has 3 teachable forms, there are however, 6 forms.


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