Konyakusha ni "Anata wa Shourai Uwaki wo Shite Watashi wo Suteru kara Wakarete Kudasai" to Ittemita

Clarice, the daughter of a count, was living a happy married life... until she was suddenly killed by an assassin. The cause was her husband, Alexis. Clarice returns to the time of her engagement with her memories intact and immediately tries to break off the engagement. However, Alexis refuses to accept the break-up, and for some reason seems to be more doting and attached to Clarice than before... This is a story of a renewed engagement that begins with the betrayal of a beloved partner.

(Source: Young Champion Web, translated)