The Fortunate Mistake and Second Life of the Margrave's Madam

https://www.cmoa.jp/title/316794/
Liese, who works as an accounting assistant at a castle, is assassinated by her husband Alexis, who has become mentally ill following a certain incident, and dies... As her consciousness fades, she finds herself transported back to a time before the incident. Liese is confused by the fact that she is suddenly living a second life, but she resolves to prevent tragedy in order to protect her loved ones! The story of a young lady who meets a tragic death and tries to restart her life begins!!