Demon Slayer: Kimetsu no Yaiba (2019)

S1E17 You Must Master a Single Thing

A member of the Twelve Kizuki, directly under Muzan Kibutsuji, is lurking nearby. After Tanjiro defeats the Mother Spider Demon on Mt. Natagumo, he discovers that a demon who could potentially transform Nezuko back into a human resides within the forest. Accompanied by the injured Inosuke, he ventures further into the woods. Meanwhile, Zenitsu wanders despondently through the trees until he comes across a spider that has a human face.