Shinimodori Reijou no Lucetta  

死に戻り令嬢のルチェッタ

In this story, we have a young woman named Lucetta who is the sole child of a struggling Earl. She becomes involved with Kyle, a wealthy businessman who agrees to take on her family's debt in exchange for their title. Despite their initial disagreements, they eventually get married. However, on their wedding day, things go awry and Lucetta passes away suddenly. When she wakes up in her second life, she finds herself back in time, just after her engagement with Kyle. In this new life, she decides to end things with him, but then discovers that he was actually a tsundere, which changes her perspective on him.