Demon Slayer: Muzan's Childhood Sweetheart

What if the monster who devoured humanity had someone who could heal him? Takahashi Sakurako has been by Muzan's side since childhood—brilliant, obsessive, and willing to twist medicine into something darker. When the healing potion is altered, the fate of demons hangs in the balance. All for the sake of the blue spider lily. She'll toy with life itself to protect what matters: her own survival and Brother Itsuku's future. But in a world where love and monstrosity intertwine, can she rewrite destiny before the Demon Slayer Corps rises?