Nezuko Kamado/Relationships, Kimetsu no Yaiba Wiki

Tanjiro is the elder brother of Nezuko and her only remaining family member alive after her family was killed. As such, Nezuko, who is usually calm and well-mannered, will become enraged and attack any Demon who harms Tanjiro. Nezuko is very protective of her brother, and being the sole surviving members of a poor family, the siblings have a very close bond, trusting and loving of one another. He is likely the only one capable of actively calming Nezuko down by calling her name or singing to her

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