A brief description of the manga For Certain Reasons, The Villainess Noble Lady Will Live Her Post-Engagement Annulment Life Freely:
Due to various circumstances, Letizia, the daughter of a ducal house, sought to have her engagement with the prince dissolved. Her efforts were successfully rewarded when the prince splendidly(?) ordered the annulment of their engagement.
Just when she thought everything was settled… she remembered her past life! Remembering her busy days as a nurse, Letzia is determined to live an easy life accompanied by her beloved alcohol.
To this end, she sets her sights on the easygoing countryside, but for some reason, she gets dragged into incident after incident!?