Yane Urabeya no Koushaku Fujin

A young woman known for her ambition finds herself unexpectedly free from the expectation of marriage, a change she welcomes as it allows her to avoid a union with anyone other than her childhood friend. When she is instead wed to a young and unkind noble, she faces mistreatment from those around her. Refusing to accept her situation, she uses her resources to take control of his estate. She now seeks to reform both the household and the duke himself, while also grappling with lingering feelings for someone else.