No, Nobara Kugisaki's death is not confirmed.
While Nobara was severely injured in a fight against the powerful curse user, Mahito, in the Jujutsu Kaisen manga and anime, her fate is still unclear. The story has left her fate open to interpretation, with fans speculating about her survival.
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Manga Spoilers: The manga has not explicitly confirmed Nobara's death. It is important to note that the story is ongoing, and there is a possibility that she could return.
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Anime Spoilers: The anime adaptation of the manga currently leaves Nobara's fate ambiguous, ending with her seemingly succumbing to her injuries. However, the anime is still adapting the manga, so it is possible that future episodes will reveal more about her fate.
It is important to remember that the story is still developing, and the author has not yet definitively confirmed Nobara's death. It is best to wait for further updates from the manga and anime to get a clearer picture of her fate.