In This Life, I'll Make You All Kneel Before Me!

Company employee Tsuyuri is killed by her fiancé just before their wedding, only to be reincarnated as Elda, the villainess in her favorite dating sim, Lucia's Moon. After realizing her new life is also a guaranteed death sentence, and that her fiancé from her past life is now the prince she admired, she decides to fight back. With the help of her loyal servant, Isak, Elda vows to change her fate, become queen, and make her enemies kneel.

Source: Line Manga, Translated