When the moon rises, the world holds its breath. Demons—immortal, flesh-eating creatures birthed from human greed—lurk in the shadows, preying on the innocent to steal their lives and youth. They fear only two things: the sun that burns their skin to ash, and the Demon Slayer Corps, a secret order of warriors who wield "Breath Styles"—ancient techniques that channel human stamina into elemental blades capable of severing demon flesh. This is a world where hope and despair walk hand in hand. A single demon attack can shatter a family in seconds, yet the Slayers fight on, driven by grief, justice, or the desire to protect what little remains. Behind the Corps' uniformed bravery lies a brutal truth: most Slayers die young, their names forgotten by the very world they defend. But for Tanjiro Kamado, a boy who lost everything, this is not just a war—it's a quest to turn his demonized sister back into a human… even if it costs him his soul.