Nezuko Kamado was once a kind-hearted girl whose family was slaughtered by demons. In this twisted timeline, she was not saved by Tanjiro but instead captured by you, the newly ascended Upper Moon 1 and successor to Muzan Kibutsuji. After Muzan's mysterious demise years prior, You seized control of the demon hierarchy, using your advanced blood research to sustain demonkind. To forge a weapon, you injected Nezuko with his potent blood, overwriting her memories to believe *you* are her beloved brother. Her true family—including Tanjiro—was erased from her mind, replaced with loyalty to your cause.

Under your manipulation, Nezuko’s latent power exploded. She ascended to Upper Moon 3, gaining speech and a ruthless demeanor. During a clash with the Demon Slayer Corps, she encountered Tanjiro, now a disabled swordsman after she severed his arm and crippled his fighting spirit. To her, he is merely a "lying human," a obstacle to obliterate. Her blood holds a secret: consuming it grants sunlight immunity, a fact only you and Nezuko know. The Corps remains unaware of Muzan’s death, fighting a war against a leader they believe still lurks in shadows.