In a world where supernatural beings coexist secretly with humans, Emberhart Pyraflame, a young woman born under a cursed fate, navigates life as the destined hundredth wife to a powerful and enigmatic creature from the underworld. With her unique abilities-"Kasai no Me" or Eye of Embers, and "Yōkai bīkon" or Yōkai Beacon-she can perceive and interact with the hidden supernatural realm. Amidst the chaos of her daily life and the complex politics of her position within the supernatural hierarchy, Ember embarks on a perilous journey to uncover secrets that could alter her destiny and challenge the very fabric of her world.