Kill the Villainess, Vol. 1 -

"Even so, I just can't bring myself to love this world." Eris Miserian knows the fate that awaits her--after losing her promised husband, the crown prince, to Helena, a daughter of a disgraced Count, Eris poisons her rival as an act of revenge. But after her plan is foiled, she is sentenced to death while Helena and the prince get to live their happily ever after. Or that is what happens in the novel Eris was reading in her past life before she woke up in this world. Now, desperate to return to her own world, she'll do everything that she can to escape what the story has laid out for her and find a way back to her real life!