Sono Seiryaku Kekkon, Tsutsushinde Ouke Itashimasu.: Nidome no Jinsei de wa Zettai ni

Lisette, the eldest daughter of a Margrave family, loses her father in battle and enters into a political marriage with Victor, the prince of a neighboring country, to stop the war. However, when Victor executes her sister, Lisette loses everything and takes her own life...or so she thinks. But when she wakes up, she finds herself back in the moment when she rejected his marriage proposal! This time, she will protect her family! Even if this is a loveless marriage... But Victor's attitude towards her is a little different from his previous life...? A pure love story that begins with a political marriage and returns to life after death begins!

(Source: Pixiv Comic, translated)