The first episode is a masterclass in building dread from a single image: a sister's poisoned corpse in a coffin, and a brother who can't let her go. D'Eon becomes a spy possessed by something between grief and duty, caught between the Church's certainty that his sister's soul is trapped and his own need to believe he can still save her. The animation from Production I.G. gives every frame, every candle, every silk thread, every moment of swordplay, the weight of genuine consequence, making 18th century Versailles feel like a place where the supernatural actually lives. The middle drags under its own mythology, but the visual precision and emotional core never waver: this is a show about a man refusing to let his sister's death mean nothing, no matter what it costs.
In 18th century France, nobleman D'Eon de Beaumont serves King Louis XV as a skilled spy. Everything changes when his sister Lia surfaces in the Seine, her body preserved in a coffin marked with the word "Psalms." Poisoned and denied a proper burial, her soul cannot rest. D'Eon swears to uncover who murdered her and why, but his investigation takes a supernatural turn when Lia's vengeful spirit possesses his body, forcing them into an uneasy partnership. Now D'Eon must navigate aristocratic intrigue and dark secrets while his sister's rage drives them deeper into a conspiracy that threatens the monarchy itself. The line between duty to the crown and loyalty to family blurs as D'Eon confronts corrupt nobles, occult mysteries, and the question of whether Lia's death was truly a crime of passion or something far more sinister. Historical atmosphere collides with psychological horror as two siblings, separated by death but bound by blood, pursue a truth that could topple the throne.