A new key visual and main theme songs have been revealed for the upcoming The Holy Grail of Eris TV anime series, which will begin broadcasting in Japan on January 8, 2026.
The anime’s opening theme song is “Happy Ever After feat. YU-KA” by Reina Washio, while the ending theme song is “Camellia” by voice actress Yukari Tamura.
JUMPEI & MORITA (LOST SONG) is directing the anime series, with Kenichi Yamamoto (MF Ghost series composer and co-scriptwriter) as series composer and scriptwriter and Chie Kawaguchi as character designer. Ashi Production is in charge of the animation production.
Meanwhile, the anime’s voice cast stars:
- • Kana Ichinose as Constance Grail
- • Sayumi Suzushiro as Scarlett Castiel
- • Yohei Azakami as Randolph Alster
- • M.A.O as Lily Orlamunde
The original fantasy light novel series is written by Kujira Tokiwa and illustrated by Yu-Nagi, which was first published by SB Creative’s GA Novel imprint on November 14, 2019 and ended on November 7, 2024. Four total volumes were released. The series began as a Shosetsuka ni Naro web novel from October 16, 2017 to August 4, 2018.
DRECOM’s DRE Novel imprint would later acquire the series and has republished five new volumes, as of November 2024.
The light novel series also inspired a manga adaptation by Hinase Momoyama in November 2019 and another sequel manga titled Eris no Seihai S by S.Kosugi in November 2024.
Yen Press releases the GA Novel volumes of The Holy Grail of Eris in English, describing the main synopsis as:
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 fiancé 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!
Sources: The Holy Grail of Eris Official Twitter (2) (3), Anime News Network