Overview
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.
Seasons & Episodes
Season 1
Key Information
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Cast & Crew
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)
Frequently Asked Questions
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...
The Holy Grail of Eris has 1 season with 12 episodes.
The Holy Grail of Eris premiered on January 8, 2026.
No, The Holy Grail of Eris has ended. The final episode aired on March 26, 2026.
The Holy Grail of Eris originally aired on MBS. Check your local streaming services for availability.
The Holy Grail of Eris has a rating of 7.4/10 based on user reviews.
The Holy Grail of Eris is classified as Animation, Mystery, Sci-Fi & Fantasy.