Watashi to Kekkon Shita Koto, Koukai Shiteimasen ka?

Odette, the daughter of a count, is arranged to marry Alphonse, the royal guard she has long admired. But this marriage isn't born of love; it's a royal decree. On a rainy day, Alphonse, a master of both swordsmanship and magic, saved Odette from a bandit attack. Struck by his gallant presence, Odette fell deeply for him. However, she soon heard a troubling rumor that Alphonse and the princess were secretly involved as lovers. Despite her heartbreak, Odette kept her feelings hidden. Years later, a marriage proposal arrived, and her intended husband was none other than Alphonse. Knowing the marriage was a cover to hide his forbidden relationship with the princess, Odette still accepted, unable to deny her longing for him. And so began a bittersweet tale of unfulfilled love, destined to be marked by heartache and quiet yearning. (Source: MangaPlaza)