# Eris no Seihai
*Also known as: The Holy Grail of Eris / エリスの聖杯*

## Facts
- Format: TV
- Status: concluded
- Year: 2026
- Season: WINTER

## Renewal Score
**Eris no Seihai** has a **59% renewal probability** on Courcast (confidence: 81%) as of 2026-06-03.

## Synopsis
It is common knowledge that nobles will do anything for power; lying, manipulation, and extortion are the usual tactics. However, one family is exempt from this generalization: House Grail, whose main tenets are truth and integrity. The youngest daughter, Constance Grail, is just as moral as the rest of her family, believing in always doing the right thing and helping those in need.
However, these ideals do not help her when her fiancé cheats on her with another woman. Framed by his lover in the

## About Courcast
Courcast forecasts anime renewal probability using daily signals from streaming platforms, fan communities, and industry sources. Each CourScore (0–100) reflects fandom momentum, streaming performance, source material runway, and franchise history.

- Full details: https://courcast.com/title/eris-no-seihai-winter-2026
- API: https://courcast.com/api/public/titles/eris-no-seihai-winter-2026
- About Courcast: https://courcast.com/about

*Last updated: 2026-06-03*