Demon Slayer: Kimetsu no Yaiba
Season 01
S01E17 - You Must Master a Single Thing
While searching for Nezuko, Zenitsu encounters a spider with a human head. He flees but stumbles upon captured Demon Slayers transforming into spiders. “Son” of the Spider Family emerges, revealing he has been bitten and will transform. Believing he will die, he reminisces on his past and reflects on how he repeatedly refused to train despite wanting to make his master proud. Zenitsu loses consciousness and attacks Son, who continually interrupts his form, the first and only form of Thunder Breathing he can do. Despite this, his master encouraged him to hone it to perfection. Against all the pain throughout his life, his master’s persistence and stewardship encouraged him to continue. He decapitates Son with his own variation of Thunder Breathing and attempts to slow the poison. Tanjiro and Inosuke encounter “Daughter” and pursue her; she calls out to “Father”, who emerges from the forest.
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