"The Dark-Hearted Saint Lady's Engagement Cancellation Agency ~ I Gave Her a Desperate Ending."

Selene Heliorose is a genius saint recognized by everyone. However, she was also the black-hearted saint rumored around town. She receives a large commission from a nobleman of a neighboring country and agrees to take on a certain request. It is to break the engagement of a reclusive princess from an authoritarian nation. Although Selene is reluctant, she is forced to accept the role of a proxy to break the engagement. But this black-hearted saint won't let things end there.