In 1920s Tamil Nadu, an ancient battle rages on between humanity and the Asurans-immortal demons cursed to feast on human flesh and burn under sunlight. Fearlessly opposing them is the Aavimurai Clan, warriors who harness Manthiram, a power that channels the energy of their souls to protect mankind. Vetri, a young boy, unknowingly inherits one of Raavanan's cursed eyes, granting him immense power but at a terrible price: the constant possibility of succumbing to transformation into an asuran, and the unwanted invasion of sadistic thoughts and instincts into his mind. Under the guidance of Viji, a fierce Aavimurai warrior, Vetri must navigate a perilous, Asuran-infested world to find a cure for his affliction-before he loses his mind entirely.