Le Chevalier D'Eon(2006)

Return from beyond and seek justice.

Le Chevalier D'Eon is an anime series set in 1742 Paris, where a nobleman investigates his sister Lia's murder and discovers a sinister conspiracy spanning Europe's royal courts and shadowed streets. When Lia's soul returns from death to possess her brother, she uses him to seek vengeance for her killing. As D'Eon becomes a vessel for his sister's rage, he navigates a dark world of political intrigue and supernatural horror, uncovering forces far more dangerous than a simple crime. The series blends historical drama with gothic mystery, following D'Eon as he struggles between his own will and Lia's vengeful presence, all while unmasking a malevolent power that threatens kingdoms themselves.