Psycho x Past: Ryōki Satsujin Sennyū Sōsa

Overview

Amelia, the daughter of a marquis who has been working hard to train to become a crown princess, is told by her fiance, the crown prince, that she has met her soulmate. What's more, he wants her to become a concubine and push the duties of the crown princess onto Amelia, since he will make his "soulmate" the crown princess! Wanting to amicably avoid being used, Amelia plans to marry Loire, a magician who became a hero after saving his country from a difficult situation in war, as a reward. When she speaks to him directly, he says, "Try your best to woo me," and the negotiations are successful! Aiming for a loving contract marriage, she begins to visit Loire, but...!? A doting love fantasy between a troubled magician and an earnest young lady ♡ (Source: Ichijinsha, translated) Note: Includes one extra chapter.

Source: AniList