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The Holy Grail of Eris 2026

★ 7.1/10 · 21 votes TV-14 AnimationMysterySci-Fi & Fantasy 1 seasons · 12 eps Ended
Community & Your Rating
★ 7.1/10
Where to watch: CrunchyrollCrunchyroll Amazon Channel
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Quick answer

What is The Holy Grail of Eris?

The television series The Holy Grail of Eris is a 2026 production that features a complex storyline with themes of betrayal, secrets, and power. According to the series' synopsis, the story revolves around Constance Grail, a viscount's daughter known for her honesty, who faces a dramatic turn of events.

Type
TV series
Year
2026
Status
Ended
Episodes
12
First aired
Jan 8, 2026
Last aired
Mar 26, 2026
Original language
JA
Origin
JP
Networks
MBS, TBS, CBC, Tulip Television
Genres
Animation, Mystery, Sci-Fi & Fantasy
Updated
Streaming Intelligence

Binge-Worthiness & Content Radar

86 /100 Highly Bingeable
⚡ Pacing & Momentum8.6/10
🧠 Narrative Depth8.9/10
🔄 Rewatch Potential8.9/10
🎬 Production Scale8.2/10
🎯 Bingeable Series #Animation #Mystery #Sci-Fi & Fantasy
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Where to watch

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How long to binge?

Estimate the schedule using 12 episodes and an average 45-minute runtime.

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Overview

The television series The Holy Grail of Eris is a 2026 production that features a complex storyline with themes of betrayal, secrets, and power. According to the series' synopsis, the story revolves around Constance Grail, a viscount's daughter known for her honesty, who faces a dramatic turn of events. The series brings together Constance and Scarlett Castiel, a noblewoman thought to be dead, as they form an unlikely alliance. As they work together, they uncover a dark conspiracy lurking in the heart of high society. The series features a cast including Tomokazu Sugita, Shoya Chiba, Hika Tsukishiro, and Ayako Kawasumi. The title of the series, The Holy Grail of Eris, incorporates the term "holy", which is defined as exalted or worthy of complete devotion, according to Merriam-Webster. The series is listed on various online databases, including IMDb and The Movie Database, where viewers can find more information about the show.

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Should you watch it?

“A betrayed noblewoman teams up with a vengeful spirit to expose a deadly conspiracy.”

Reasons to watch
  • Intriguing dual-protagonist dynamic
  • Rich gothic atmosphere
  • Twists rooted in high-society intrigue
Keep in mind
  • Pacing may feel slow to some
  • Supernatural elements might confuse viewers

You enjoy dark fantasy with strong female leads and ghostly alliances.

Contains themes of betrayal, execution, and supernatural possession; suitable for mature teens and adults.

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Episode guide

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Filler vs. Essential Canon

Filter episodes by serialized narrative importance. Skip standalone side quests and streamline your binge.

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67%
Mytharc (4): Crucial lore & season climaxes
Core (8): Character development & subplots
Side Quest (0): Standalone / filler
Season 1 · 12 episodes Open the complete Season 1 guide & lore primer →
Verified insights

Frequently asked questions

Is The Holy Grail of Eris based on a book?

Yes, it is adapted from a novel series by Kujira Tokiwa.

How many episodes are there?

The series consists of 12 episodes.

Where can I watch it?

It aired in Japan and is available via various streaming platforms.

What genre is the show?

It blends dark fantasy, mystery, and supernatural drama.

Who are the main characters?

Constance Grail and Scarlett Castiel are the central figures.

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