Demon Slayer: Kimetsu no Yaiba
Season 1, Episode 17: You Must Master a Single Thing
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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.
All Episodes - Season 1
Episode 1
Cruelty
Episode 2
Trainer Sakonji Urokodaki
Episode 3
Sabito and Makomo
Episode 4
Final Selection
Episode 5
My Own Steel
Episode 6
Swordsman Accompanying a Demon
Episode 7
Muzan Kibutsuji
Episode 8
The Smell of Enchanting Blood
Episode 9
Temari Demon and Arrow Demon
Episode 10
Together Forever
Episode 11
Tsuzumi Mansion
Episode 12
The Boar Bares Its Fangs, Zenitsu Sleeps
Episode 13
Something More Important Than Life
Episode 14
The House With the Wisteria Family Crest
Episode 15
Mount Natagumo
Episode 16
Letting Someone Else Go First
Episode 17
You Must Master a Single Thing
Episode 18
A Forged Bond
Episode 19
Hinokami
Episode 20
Pretend Family
Episode 21
Against Corps Rules
Episode 22
Master of the Mansion
Episode 23
Hashira Meeting
Episode 24
Rehabilitation Training
Episode 25
Tsuguko, Kanao Tsuyuri
Episode 26
New Mission