Yarinaoshi Henkyou Hakufujin no Koufuku na Gosan

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! Source: MU