Demon Slayer S1 Ep. 17: You Must Master a Single Thing
The Twelve Kizuki, directly subordinate to Muzan Kibutsuji, are here� When Tanjiro slays the mother of the Spider Demons of Mount Natagumo, he learns that a demon who might become the key to turning Nezuko back into a human could be in this very forest. Despite how battered Inosuke is, he heads deeper into the forest with Tanjiro. Meanwhile, Zenitsu trudges forlornly through the woods, only to encounter a human-headed spider.