Betrayed by her fiancé's lover and sentenced to public execution, Constance Grail, a plain viscount's daughter known for her honesty, faces death—until a mysterious voice offers salvation. Scarlett Castiel, a noblewoman long thought dead, may be her only hope. Together, these unlikely allies uncover a dark conspiracy lurking in the heart of high society, where betrayal, secrets, and power collide.

The Holy Grail of Eris (2026)

★ 7.4/10 January 8, 2026 1 season

AnimationMysterySci-Fi & Fantasy

Betrayed by her fiancé's lover and sentenced to public execution, Constance Grail, a plain viscount's daughter known for her honesty, faces death—until a mysterious voice offers salvation. Scarlett Castiel, a noblewoman long thought dead, may be her only hope. Together, these unlikely allies uncover a dark conspiracy lurking in the heart of high society, where betrayal, secrets, and power collide.

Where to watch

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Trailer

Cast

Kana Ichinose Constance Grail (voice) Sayumi Suzushiro Scarlett Castiel (voice) Yohei Azakami Randolph Ulster (voices) Mao Ichimichi Lily Orlamunde (voice) Maaya Uchida Cecilia Adelbide (voice) Natsuki Hanae Enrique Adelbide (voice) Jun Fukuyama Dominic Harmsworth (voice)