The Holy Grail of Eris, an upcoming TV anime based on the fantasy light novel series, has published a new trailer and new key art for the series. At the time of this reporting, the exact release date for the series has not yet been revealed.
The Holy Grail of Eris Trailer
The original The Holy Grail of Eris light novels are written by Kujira Tokiwa, illustrated by Yu-nagi, and published in Japan by SB Creative and Drecom Media. Yen Press publishes English language versions of the novel series as well as the manga adaptation with artwork by Hinase Momoya. JUMPEI & MORITA direct the TV anime at animation studio Ashi Productions. Kenichi Yamashita provides the series composition and scripts, Chie Kawaguchi acts as character designer and Jun Yukawa acts as assistant character designer.

The Holy Grail of Eris key art
Yen Press describes The Holy Grail of Eris:
As a viscount’s daughter, Constance Grail is an ordinary girl whose only notable trait is sincerity, leaving her with no real options when someone steals her fiancé and falsely accuses her of petty theft at a ball. While Connie awaits her undeserved punishment, a ghost appears to offer a bargain. The spirit is none other than Scarlett Castiel, a noblewoman once praised for her beauty, lineage, and undeniable charisma-and executed some ten years earlier for her wicked deeds. When Connie accepts this proposal, she is possessed by the infamous spirit who instantly turns the tide on her tormenter, thus saving the hapless girl from her miserable fate. It’s never wise striking a deal without knowing exactly what you’ve committed to, though…or you might find yourself bound to a ghost dead set on revenge against her own enemies!