Webtanjirou and nezuko's sibling bond is unbreakable, even after nezuko becomes a demon and loses her memories.
Nezuko's evolution as a demon proves her.
Webwith the beginning of the series seeing tanjiro and his sister nezuko set on their path following the death of their family at the hands of the head demon, muzan.
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Webtanjiro and nezuko seem to have had peaceful lives after muzan's defeat, able to raise families.
Tanjiro, of course, did suffer massive injuries in the final battle.