The Holy Grail of Eris (2026 Anime Series) - Season 1 - Episode 1

Constance Grail, a sincerity-driven daughter of a plain viscount who is falsely accused of theft and betrayal at a noble ball. Facing undeserved punishment, she makes a desperate pact with the ghost of Scarlett Castiel, a notoriously beautiful but wicked noblewoman executed ten years earlier for an attempted poisoning. Possessed by Scarlett's spirit, Constance clears her name but becomes entangled in a massive conspiracy involving revenge, high-society secrets, and a decade-old mystery.