Fantasy Thriller 'The Holy Grail of Eris' Unveils Key Voice Cast Additions Ahead of January 2026 Debut

The highly anticipated television anime adaptation of Kujira Tokiwa’s light novel series, The Holy Grail of Eris, is moving toward its scheduled debut on January 8, 2026. This week, the production team unveiled three significant additions to the voice ensemble, further solidifying the cast tasked with bringing this complex world of political intrigue and supernatural drama to life.

Joining the previously announced leads, Kana Ichinose as the protagonist Constance Grail and Sayumi Suzushiro as the infamous spirit Scarlett Castiel, are three seasoned performers who will portray key supporting roles.

New Cast Members Announced

The newly announced cast members include:

• Yōhei Azakami, stepping into the role of Randolph Ulster.
• M.A.O, cast as Lily Orlamunde.
• Maaya Uchida, who will portray Cecilia Adelbide.

These performers are essential in adding depth and nuance to the intricate web of characters central to the series' suspenseful narrative.

Series Premise and Production Details

The Holy Grail of Eris plunges audiences into a dark fantasy setting centered on Constance Grail, a young noblewoman facing ruin after being unjustly accused. Her salvation arrives unexpectedly in the form of the vengeful ghost of Scarlett Castiel, a notoriously executed villainess who possesses Constance's body. Bound by circumstance, the two women form an uneasy alliance. Their shared objective is to meticulously dismantle the deep-seated conspiracies that led to Scarlett’s demise and continue to threaten the stability of the realm.

The production features significant creative talent, spearheaded by Ashi Productions, in collaboration with production partners Good Smile Film and DRE Pictures. Junpei Morita directs the series, ensuring a cohesive vision, while Kenichi Yamashita handles series composition, translating the novel’s complex plotting into an episodic structure. Visually, Chie Kawaguchi’s character designs are set to capture the required historical aesthetic and intense emotionality, elements that have been prominently featured in recent promotional materials emphasizing the show's mysterious and dramatic atmosphere.

Originally published by SB Creative under the GA Novel imprint, Kujira Tokiwa’s light novel achieved success that led to a popular manga adaptation illustrated by Hinase Momoyama. The manga is serialized on Square Enix’s Manga UP! platform and is available to Western readers through Yen Press. This latest cast announcement confirms that the anime production is rapidly nearing completion, promising fans a faithful and dynamic realization of this beloved narrative blending mystery, possession, and high drama.