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TV series
Poster for The Holy Grail of Eris

The Holy Grail of Eris

2026 · 1 season

A slow-burning, atmospheric mystery that draws you into a world of aristocratic intrigue and supernatural whispers, with a constant undercurrent of danger.

Genres
Animation, Mystery, Sci-fi & fantasy
Overview
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.
How it feels
Dark, tense, melancholic and romantic. Measured and needs your attention.
About
Betrayal, conspiracy, power, justice
Content
Mild violence and language. No gore or sexual content.
Note
Written by AI, so it can be wrong. Full breakdown

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Stream in the US
  • Crunchyroll
More options Data from JustWatch
Genres
Animation, Mystery, Sci-fi & fantasy
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How it feels

Written by AI. It can be wrong.

Full breakdown
Tone
  • darkstrength 2 of 3
  • tensestrength 2 of 3
  • melancholicstrength 1 of 3
  • romanticstrength 1 of 3
Pacing
measured, 2 of 4, from slow-burn to relentless
Attention
engaged, 3 of 4, from background-friendly to demanding
Era
period
Audience
teen
Content intensity
  • Gore none
  • Language mild
  • Violence mild
  • Sex none
All scales, 0 to 10
Scales, 0 to 10
ScaleValue0 to 10
Action3
Horror2
Humour3
Realism4
Romance3
Tension6
Darkness6
Complexity6
Emotional weight6

Cast

Where to watch in the US

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Stream
  • Crunchyroll

Streaming data from JustWatch.All options on TMDB

Details

Genres
animation, mystery, sci-fi & fantasy
Starring
Kana Ichinose, Sayumi Suzushiro, Yohei Azakami, Mao Ichimichi, Maaya Uchida, Natsuki Hanae, Jun Fukuyama
Music
Toru Ishitsuka, Yoshiaki Dewa
Cinematography
Yuko Kamahara
Length
1 seasons, 12 episodes
Network
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
Country
Japan
Languages
Japanese

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