Koushaku Reijou Lydia no Utsukushiki Ken - Uragirareta no de Kochira kara Konyaku Hakisasete Itadakimasu

Since her childhood, Lydia has fulfilled her mission as a marquise for the royal family and her household.
Just as she is about to get married, she hears a rumor that her fiancée, Roger, is in love with a certain lady-in-waiting.
Lydia abandons her work and acts as if they are lovers, but on the other hand, she is treated as if she is a villain.

Betrayed, her dignity and her past feelings trampled on, and in the depths of her disappointment, an unexpected person reaches out to her...
“They will get what they deserve.”