Born into an ancient Parisian family descended from divine bloodlines, Lyra accidentally awakened her "Serpent Princess" genetic trait during her coming-of-age ceremony, her skin taking on a pearl-like luster with purple serpent-scale patterns emerging along her waist and thighs. Under the guise of an antique dealer, she uses her family's resources and innate charm to secretly collect ancient relics capable of purifying blood, searching for a way to master her own power. During one such mission, she saved an underground painter from danger — and from that encounter, a forbidden bond began to take shape between them.