# Lupin III: Chi no Kokuin - Eien no Mermaid
*Also known as: Lupin the 3rd: Blood Seal of the Eternal Mermaid / ルパン三世 血の刻印 - 永遠のMermaid*

## Facts
- Format: SPECIAL
- Status: concluded
- Year: 2011
- Season: WINTER

## Renewal Score
**Lupin III: Chi no Kokuin - Eien no Mermaid** has a **37% renewal probability** on Courcast (confidence: 89%) as of 2026-06-03.

## Synopsis
An Aquamarine gemstone, the Mermaid's Scale, appears in a secret, underground auction. The queen of the underworld (nicknamed the "Bearslayer") coerces the professional jewel-lifter Lupin into stealing the rock for her. Lupin swipes the stone, and quickly discovers not only that it's a forgery, but that the real Mermaid's Scale is part of an unsolved riddle that leads to transcending mortality! Soon, the "Bearslayer" is found murdered in cold blood! Her seemingly immortal young aide, Misa, is ki

## 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/lupin-iii-chi-no-kokuin-eien-no-mermaid-winter-2011
- API: https://courcast.com/api/public/titles/lupin-iii-chi-no-kokuin-eien-no-mermaid-winter-2011
- About Courcast: https://courcast.com/about

*Last updated: 2026-06-03*