The official website for the television anime adaptation of Kujira Tokiwa's Eris no Seihai (The Holy Grail of Eris) light novel announced the supporting cast on Friday. The anime is scheduled to premiere on January 8 at 11:56 p.m. on TBS' 28 affiliated stations, followed by BS11.

Cast
Cecilia Adelbide: Maaya Uchida (Tate no Yuusha no Nariagari)
Enrique Adelbide: Natsuki Hanae (Kimetsu no Yaiba)
Dominic Harmsworth: Jun Fukuyama (Ookami to Koushinryou)

J-pop singer Reina Washio (Kizu darake Seijo yori Houfuku wo Komete) and YU-KA (Metallic Rouge) are performing the opening theme "Happy Ever After." Voice actress Yukari Tamura (Lost Song) is performing the ending theme "Camellia."

Morita to Junpei (Lost Song) is directing the anime at Ashi Productions. Kenichi Yamashita (MF Ghost) is handling the script and series composition. Chie Kawaguchi (Utawarerumono: Futari no Hakuoro animation director) is designing the characters.

Tokiwa began penning the fantasy drama novel on the Shousetsuka ni Narou website in October 2017. SB Creative published four volumes under its GA Novels imprint from November 2019 to March 2022, featuring illustrations by Yuunagi (Saikyou Onmyouji no Isekai Tenseiki). Drecom Media published a new edition through its DRE Novels label, beginning with the first five volumes on November 7.

Hinase Momoyama began drawing a manga adaptation on the Manga UP! website in November 2019. Square Enix published the 13th volume on September 5.

S. Kosugi launched the sequel manga titled Eris no Seihai S on the DRE Comics website in October 2024. Drecom Media released the second volume on September 5.

Yen Press publishes both the light novel and manga in English and published the fourth novel volume in October 2023 and the tenth manga volume on July 22. The 11th manga volume will go on sale on January 20, 2026.

Source: Moca News