The Holy Grail of Eris

Synopsis

Betrayed by her fiancé's lover and sentenced to public execution, Constance Grail, a plain viscount's daughter known for her honesty, faces death—until a mysterious voice offers salvation. Scarlett Castiel, a noblewoman long thought dead, may be her only hope. Together, these unlikely allies uncover a dark conspiracy lurking in the heart of high society, where betrayal, secrets, and power collide.

First Air Date: 2026-01-08

Last Air Date: 2026-03-26

Number of Seasons: 1

Number of Episodes: 12

Networks: MBS, TBS, CBC, Tulip Television, SBC, BSN, tys, NBC, HBC, RKK, i-Television, SBS, IBC, BSS, MRO, OBS, TUF, RSK, TUY, tbc, RKB, KUTV, RBC, UTY, RCC, MRT, ATV, MBC

View Technical Specifications on IMDb

Top Cast

Kana Ichinose as Constance Grail (voice)
Sayumi Suzushiro as Scarlett Castiel (voice)
Yohei Azakami as Randolph Ulster (voices)
Mao Ichimichi as Lily Orlamunde (voice)
Maaya Uchida as Cecilia Adelbide (voice)
Natsuki Hanae as Enrique Adelbide (voice)
Jun Fukuyama as Dominic Harmsworth (voice)

Seasons

Season 1 (2026)

No overview available for this season.

Episodes:

Ep. 1: At the Grand Merillian (2026-01-08)

Constance Grail attends a party only to find her fiancé kissing another woman and herself accused of a crime.
Ep. 2: An Extraordinary Villainess and an Ordinary Girl (2026-01-15)

The ghostly Scarlett demands that Constance repay her help by avenging her death.
Ep. 3: Respective Answers and Beginnings (2026-01-22)

Constance and Scarlett follow a tip to a masked ball with a sinister reputation.
Ep. 4: The Silent Ladies' Tea Party (2026-01-29)

Constance receives a summons from an investigative committee determined to put her on trial.
Ep. 5: And the Cock Crows to Herald the Dawn (2026-02-05)

Constance's carriage suffers a shocking attack and an even more shocking rescue.
Ep. 6: The Command of the Goddess (2026-02-12)

Both Constance and Randolph uncover fresh clues, but Lily's last message remains shrouded in mystery.
Ep. 7: A Banquet of Insectivorous Plants (2026-02-19)

Daeg Gallus contrives to murder Aisha before she can reveal the truth and cast suspicion on Abigail.
Ep. 8: Lily Orlamunde (2026-02-26)

Constance, Scarlett, and Randolph discover a letter that reveals Lily's struggle and the truth she uncovered.
Ep. 9: The Holy Grail of Eris (2026-03-05)

Scarlett possesses Constance to confront her own father.
Ep. 10: For the Future (2026-03-12)

Constance, Scarlett, and Randolph pursue the kidnapped Ulysses and stumble into a shootout.
Ep. 11: Those Who Defy Fate (2026-03-19)

Constance is jailed on her own testimony and given a sentence of death.
Ep. 12: The Final Chapter: At the Grand Merillian (2026-03-26)

As the hour of Constance's execution approaches, Scarlett finds a crucial document and Cecilia makes her move.