As a viscount's daughter, Constance Grail was an average young woman with no remarkable qualities except for her sincerity. Her misfortune began when her fiancé was stolen away from her and she was falsely accused of petty theft at a ball. While awaiting her unjust punishment, she encountered a ghost who offered her a deal. This ghost was none other than Scarlett Castiel, a noblewoman known for her beauty, lineage, and charisma. She had been executed ten years earlier for her wrongdoings. When Connie agreed to this proposal, she was possessed by Scarlett Castiel's spirit, which instantly reversed her fortunes by taking revenge against her tormentor. However, it's important to note that making deals with unknown entities can have unforeseen consequences, so one should always be cautious before agreeing to any terms.
Eris no Seihai began as a web novel on Shousetsuka ni Narou on October 16, 2017. SB Creative Corp. released a revised and illustrated version of the series from November 14, 2019 to October 14, 2020 under its GA Novels label.The series has been published in English as The Holy Grail of Eris by Yen Press since April 19, 2022.