Dannasama wa Taihen Isogashii Okata nano desu

Lisette marries Leonard, the head of the prestigious Salvert Marquis family.
Though it is a political marriage, she resolves, “If I’m going to do this, I’ll win my husband’s heart.”
What awaits her, however, is the unthinkable - a wedding with the groom absent?!
Even after the marriage, Lisette never once meets Leonard. She spends her lonely days shut away in the mansion, devoted solely to her needlework.
“So… a wife of convenience isn’t even worth meeting in person. That’s what you believe, isn’t it?”
At last, her patience snaps.
Lisette sets a certain trap in Leonard’s room and boldly declares war!
Thus begins a fierce battle of pride and stubborn wills between husband and wife, set within a noble marquis household - a dramatic marital showdown now unfolds!!

https://www.cmoa.jp/title/349194/