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The Holy Grail of Eris
RELEASED·SERIES·JA

The Holy Grail of Eris

Thu, Jan 8, 2026
  • Animation
  • Mystery
  • Sci-Fi & Fantasy
Series · Synopsis

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.

Trailer

Watch the trailer

Where to watch

Streaming on

  • Crunchyroll↗
  • Crunchyroll Amazon Channel↗
Cast

Top of the call sheet

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

1 season · 12 episodes

To Be Determined · 12 aired
Season 1
12 episodes · 12 aired
▾
  • E1
    At the Grand Merillian
    Aired · Thu, Jan 8, 2026 · 30m

    Constance Grail attends a party only to find her fiancé kissing another woman and herself accused of a crime.

  • E2
    An Extraordinary Villainess and an Ordinary Girl
    Aired · Thu, Jan 15, 2026 · 30m

    The ghostly Scarlett demands that Constance repay her help by avenging her death.

  • E3
    Respective Answers and Beginnings
    Aired · Thu, Jan 22, 2026 · 30m

    Constance and Scarlett follow a tip to a masked ball with a sinister reputation.

  • E4
    The Silent Ladies' Tea Party
    Aired · Thu, Jan 29, 2026 · 30m

    Constance receives a summons from an investigative committee determined to put her on trial.

  • E5
    And the Cock Crows to Herald the Dawn
    Aired · Thu, Feb 5, 2026 · 30m

    Constance's carriage suffers a shocking attack and an even more shocking rescue.

  • E6
    The Command of the Goddess
    Aired · Thu, Feb 12, 2026 · 30m

    Both Constance and Randolph uncover fresh clues, but Lily's last message remains shrouded in mystery.

  • E7
    A Banquet Of Insectivorous Plants
    Aired · Thu, Feb 19, 2026 · 30m

    Daeg Gallus contrives to murder Aisha before she can reveal the truth and cast suspicion on Abigail.

  • E8
    Lily Orlamunde
    Aired · Thu, Feb 26, 2026 · 30m

    Constance, Scarlett, and Randolph discover a letter that reveals Lily's struggle and the truth she uncovered.

  • E9
    The Holy Grail of Eris
    Aired · Thu, Mar 5, 2026 · 30m

    Scarlett possesses Constance to confront her own father.

  • E10
    For the Future
    Aired · Thu, Mar 12, 2026 · 30m

    Constance, Scarlett, and Randolph pursue the kidnapped Ulysses and stumble into a shootout.

  • E11
    Those Who Defy Fate
    Aired · Thu, Mar 19, 2026 · 30m

    Constance is jailed on her own testimony and given a sentence of death.

  • E12
    The Final Chapter: At the Grand Merillian
    Aired · Thu, Mar 26, 2026 · 30m

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