Series synopsis
The Holy Grail of Eris, also known as エリスの聖杯 is a Japanese animation mystery sci-fi & fantasy television series that premiered on MBS on January 8, 2026. It ended on March 26, 2026. It stars Kana Ichinose, Sayumi Suzushiro, Yohei Azakami and Mao Ichimichi.
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.
Premise
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.
Cast and characters
Leading 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)
Episodes
This series spans 1 season with 12 episodes.
| Season | Episodes | First aired | Last aired |
|---|---|---|---|
| Season 1 | 12 | January 8, 2026 | March 26, 2026 |
| Episode | Title | Air date |
|---|---|---|
| 1 |
At the Grand Merillian Constance Grail attends a party only to find her fiancé kissing another woman and herself accused of a crime. |
January 8, 2026 |
| 2 |
An Extraordinary Villainess and an Ordinary Girl The ghostly Scarlett demands that Constance repay her help by avenging her death. |
January 15, 2026 |
| 3 |
Respective Answers and Beginnings Constance and Scarlett follow a tip to a masked ball with a sinister reputation. |
January 22, 2026 |
Production
Release
| Original network/platform | MBS |
|---|---|
| First aired | January 8, 2026 |
| Last aired | March 26, 2026 |
| Status | ended |