The upcoming The Holy Grail of Eris anime revealed a key visual alongside the theme song artists and a January 8 premiere on Friday. Reina Washio performs the opening theme song “Happy Ever After feat. YU-KA,” and Yukari Tamura sings the ending theme song “Camellia.”
The Holy Grail of Eris is a Japanese light novel series written by Kujira Tokiwa and illustrated by Yuunagi. A manga adaptation, illustrated by Hinase Momoyama, has been serialized online through Square Enix’s Manga Up! website since November 2019.
Morita to Jumpei is directing the anime adaptation at studio Ashi Productions. Kenichi Yamashita is handling the series composition and scriptwriter, while Chie Kawaguchi is the character designer. A trailer was released at Anime Expo 2025. The main cast includes:
- Sayumi Suzushiro as Scarlett Castiel
- Kana Ichinose as Constance “Connie” Grail
- Yohei Azakami as Randolph Ulster
- M・A・O as Lily Aulamunde
Yen Press is licensing the light novel in English and describes the story:
As a viscount’s daughter, Constance Grail is an ordinary girl whose only notable trait is sincerity, leaving her with no real options when someone steals her fianc and falsely accuses her of petty theft at a ball. While Connie awaits her undeserved punishment, a ghost appears to offer a bargain. The spirit is none other than Scarlett Castiel, a noblewoman once praised for her beauty, lineage, and undeniable charisma-and executed some ten years earlier for her wicked deeds. When Connie accepts this proposal, she is possessed by the infamous spirit who instantly turns the tide on her tormenter, thus saving the hapless girl from her miserable fate. It’s never wise striking a deal without knowing exactly what you’ve committed to, though…or you might find yourself bound to a ghost dead set on revenge against her own enemies!
Source: The Holy Grail of Eris Official Website, Anime Expo 2025
© 2024 Kujira Tokiwa / Drecom / Holy Grail of Eris Production Committee
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