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Nezuko Kamado is from the popular anime Kimetsu no Yaiba. She is Tanjirou’s sister and was turned into a Demon by Muzan Kibutsuji. As a demon, Nezuko seems to have forgotten a good portion of her memories as a human aside of those related to her family.

Demon Slayer: Kimetsu no Yaiba  (from Kimetsu no Yaiba Wiki)
Demon Slayer: Kimetsu no Yaiba (lit. "Blade of Demon Destruction") is a manga series written and illustrated by Koyoharu Gotoge. It has been serialized in Weekly Shonen Jump since February 15, 2016. The series is republished in English by Viz Media. The series officially ended on May 18, 2020 (Weekly Shonen Jump Issue #24) with a total of 205 chapters.

STORY: In Taisho-era Japan, Tanjiro Kamado is a kindhearted boy who makes a living selling charcoal. However, his peaceful life is shattered when a Demon slaughters his entire family. His little sister Nezuko is the only survivor, but she has been transformed into a Demon herself! Tanjiro sets out on a dangerous journey to find a way to return his sister to normal and destroy the Demon who ruined his life.

Nezuko Kamado is the deuteragonist of Demon Slayer: Kimetsu no Yaiba. She is a demon and the younger sister of Tanjiro Kamado and one of the two remaining members of the Kamado family. Formerly a human, she was attacked and transformed into a demon by Muzan Kibutsuji.