The Holy Grail of Eris

The Holy Grail of Eris (エリスの聖杯) is a Japanese light novel series written by Kujira Tokiwa and illustrated by Yuunagi. It was serialized online from October 2017 to August 2018 on the user-generated novel publishing website Shōsetsuka ni Narō. It was later acquired by SB Creative, who have published four volumes from November 2019 to March 2022 under their GA Novel imprint. A manga adaptation with art by Hinase Momoyama has been serialized online via Square Enix's Manga Up! website since November 2019 and been collected in fourteen volumes. A new edition of the light novel series by the same author and illustrator was published in five volumes by Drecom Media in November 2024 under their DRE Novels imprint. A sixth volume and a digital short story collection were released in January 2026. An anime television series adaptation produced by Ashi Productions aired from January to March 2026.

Plot

A decade ago, Scarlett Castiel was executed for supposedly trying to poison the prince's lover. In the present, Constance Grail becomes involved with helping the ghost of Scarlett figure out the chain of events that led to her death. As a result, both of them eventually discover a conspiracy that involves nations.

Characters

• Constance Grail (コンスタンス・グレイル)
• A kind-hearted low-ranked noble. She was almost vilified at a party, until Scarlett briefly possessed her to humiliate and expose the one who had framed Constance for "stealing" her treasured hairpin. She does not get along with nobles who look down on commoners and loathes baseless gossip. She makes it her life's mission to assist Scarlett in getting her vengeance.
• Scarlett Castiel (スカーレット・カスティエル)
• A restless ghost seeking answers as to why she was killed, believing that she had done nothing to warrant execution a decade ago at just sixteen years of age. Haughty but brilliant and open-minded, Scarlett gives Constance leads on people she knew.
• Randolph Ulster (ランドルフ・アルスター)
• Randolph was Lily's husband until her untimely death and ended up engaged to Constance and helped her with investigating Scarlett's case. He was the first person to learn about Scarlett's ghost. As time goes by, he ends up developing genuine feelings for Constance.
• Lily Orlamunde (リリィ・オーラミュンデ)
• Lily was a nun of the church and helped many orphaned children. When she was later found dead, it was believed that she committed suicide, albeit some believed otherwise.
• Cecilia Adelbide (セシリア・アデルバイド)
• [2]
• The princess who is the reason Scarlett was executed. While appearing to be playful and aloof, she is actually manipulative and calculating. In the past, Cecilia was an orphan who was initially mistaken as a boy until the orphanage was burned down by a corrupt noble who did not want a scandalous secret to be revealed. As a result, she willingly joined Daeg Gallus to get her revenge.
• Enrique Adelbide (エンリケ・アデルバイド)
• The crown prince who was originally engaged to Scarlett prior to his engagement to Cecilia. He deeply regrets not being able to save Scarlett.
• Dominic Harmsworth (ドミニク・ハームズワース)
• [2]
• A pope of the church who is somehow able to see Scarlett's ghost and helps her out whenever she needs it.

Media

See also

• Bonjin Tensei no Doryoku Musō, another light novel series illustrated by Yuunagi
• The Banished Court Magician Aims to Become the Strongest, another light novel series illustrated by Yuunagi
• The Insipid Prince's Furtive Grab for The Throne, another light novel series illustrated by Yuunagi
• The Reincarnation of the Strongest Exorcist in Another World, the version of the novel series is also illustrated by Yuunagi

External links

• at Shōsetsuka ni Narō