Nezuko Kamado, born to a family of Mount Kumotori charcoal makers, saw her life irrevocably altered when Muzan Kibutsuji slaughtered her kin and transformed her into a demon. Surviving alongside her brother Tanjiro, now a Demon Slayer seeking her cure, she defied her demonic instincts through subconscious conditioning by Sakonji Urokodaki, who ingrained in her a protective perception of humans as family. This mental safeguard allowed her to replenish strength via sleep instead of human flesh, though extended rest periods followed significant exertion. As a demon, Nezuko bore sharp nails, fangs, and hair fading from black to flame-orange. A bamboo muzzle restrained her bite, while sunlight forced her into a daylight-proof wooden box. Her Blood Demon Art, Exploding Blood, ignited her blood into searing flames lethal solely to demons—a power pivotal in battles against Upper Ranks like Rui, whose threads she severed, and Gyutaro, whose poison she countered. Confronting Upper Rank Six Daki in the Entertainment District Arc triggered Nezuko’s Advanced Demon Form: a horn protruded from her forehead, vine-like patterns etched her skin, and her regeneration rivaled Upper Rank demons. Yet this power unleashed feral aggression, nearly driving her to attack a human until Tanjiro subdued her with a childhood lullaby, underscoring her precarious balance between demonic force and lingering humanity. A turning point emerged when Nezuko withstood sunlight during the clash against Hantengu, becoming the first sun-immune demon—a breakthrough that drew Muzan’s relentless pursuit. Her blood also healed allies, neutralizing toxins like Gyutaro’s, further distinguishing her from other demons. In later arcs, Nezuko regained speech and fragmented awareness, her memories fully restored after consuming Tamayo’s medicine. Reclaimed humanity let her indirectly aid Muzan’s final defeat, symbolizing hope for demon redemption. Post-victory, she reverted to human form, her hair retaining faint orange hues. The epilogue depicted her peaceful life in a demon-free era, legacy enduring through descendants. Nezuko’s bond with Tanjiro anchored her existence, her demonic ferocity always shielding him. She earned trust from allies like Zenitsu and Inosuke through steadfast loyalty, while alliances with Tamayo and Yushiro positioned her as a bridge between species, challenging the Demon Slayer Corps’ view of demons as irredeemable.