TEKIKOKU DE REIGUU SARETA KOUJO-SAMA WA OTTO NO AI NI KIZUKANAI

Princess Mira of the Casparia Empire married into the enemy kingdom of Edelgard, enduring all kinds of mistreatment in the name of peace. However, her hopes were dashed when her homeland was destroyed and she was ordered to divorce. On the day of their separation, just as she was about to return the wedding ring to her husband, Prince Klaus—a man who never loved her—she somehow time-leaped back to their wedding day!? As she searches for a way to save her homeland once again, she uncovers many unknown sides of her husband!? (Source: Kadokawa, translated) — Description from AniList community (anilist.co).