

The Holy Grail of Eris
Eris no Seihai
Most nobles will lie, manipulate, and scheme their way to power without hesitation. House Grail is different. Built on truth and integrity, the family lives by those principles—including Constance, the youngest daughter, who genuinely believes in doing right by others. That moral compass doesn't protect her when her fiancé sleeps with another woman and then frames her for it. Desperate for help, Constance finds everyone turning away—except for Scarlet Castiel, a vengeful spirit who possesses her and flips the script on her accuser. The problem? Scarlet expects payment. A decade earlier, Scarlet was executed for trying to kill Princess Cecilia. Except she didn't do it. As ruthless as Scarlet could be, poisoning was never her style. Someone set her up, and she still doesn't know who. Now that Constance is the only person who can see her, Scarlet has demands: help me get revenge on everyone who destroyed me.
Content compiled by AnimeList.moe from publicly available sources.


The Holy Grail of Eris
Eris no Seihai
12
2026
Synopsis
Most nobles will lie, manipulate, and scheme their way to power without hesitation. House Grail is different. Built on truth and integrity, the family lives by those principles—including Constance, the youngest daughter, who genuinely believes in doing right by others. That moral compass doesn't protect her when her fiancé sleeps with another woman and then frames her for it. Desperate for help, Constance finds everyone turning away—except for Scarlet Castiel, a vengeful spirit who possesses her and flips the script on her accuser. The problem? Scarlet expects payment. A decade earlier, Scarlet was executed for trying to kill Princess Cecilia. Except she didn't do it. As ruthless as Scarlet could be, poisoning was never her style. Someone set her up, and she still doesn't know who. Now that Constance is the only person who can see her, Scarlet has demands: help me get revenge on everyone who destroyed me.
Content compiled by AnimeList.moe from publicly available sources.
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The Holy Grail of Eris
Eris no Seihai
Most nobles will lie, manipulate, and scheme their way to power without hesitation. House Grail is different. Built on truth and integrity, the family lives by those principles—including Constance, the youngest daughter, who genuinely believes in doing right by others. That moral compass doesn't protect her when her fiancé sleeps with another woman and then frames her for it. Desperate for help, Constance finds everyone turning away—except for Scarlet Castiel, a vengeful spirit who possesses her and flips the script on her accuser. The problem? Scarlet expects payment. A decade earlier, Scarlet was executed for trying to kill Princess Cecilia. Except she didn't do it. As ruthless as Scarlet could be, poisoning was never her style. Someone set her up, and she still doesn't know who. Now that Constance is the only person who can see her, Scarlet has demands: help me get revenge on everyone who destroyed me.
Content compiled by AnimeList.moe from publicly available sources.
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The Holy Grail of Eris
Eris no Seihai
エリスの聖杯