"Raise de Kekkonshitekuremasu ka" to Chikatta Buka ga, Gensei de wa Toshiue no Kishi Danchou-sama ni Natteite, Hontouni Kekkon wo Semarareteiru Ken

Histoire

Livia, a noble lady, has been having strange dreams lately. — Dreams of being defeated on a battlefield, exchanging marriage vows with her aide's final breath, as he died shielding her — even though she never remembers the details upon waking. Then one day, at a party in the royal palace, Livia meets Claudio, the knight-commander and heir of the grand duke. In that instant, the past became clear, and Livia recalls… that Claudio before her was none other than Louis, the aide she had pledged marriage in her previous life, when she was known as Beatrice!

Synopsis via AniList (en anglais).