Kanchigai Kekkon: Itsuwari no Hanayome no Hazu ga, Naze ka Ryuuou Heika ni Dekiaisaretemasu!?Kanchigai Kekkon; 勘違い結婚; 勘違い結婚　偽りの花嫁のはずが、なぜか竜王陛下に溺愛されてます！？; Kanchigai Kekkon: Itsuwari no Hanayome no Hazu ga, Naze ka Ryuuou Heika ni Dekiaisaretemasu?!; Misunderstood Marriage: I Was Supposed to Be a False Bride, but for Some Reason, His Majesty the Dragon King Is Madly in Love with Me?!; Misunderstood Marriage

Mireille, the princess of the small and struggling nation of Grilles, suddenly finds herself the subject of a marriage proposal from Cain, the king of the great nation of Drake. However, it quickly becomes clear that Cains true object of affection is her younger sister, and the proposal was made to the wrong person. Despite this revelation, Mireille is forced by her father to take her sisters place and marry Cain as a stand-in bride. Prepared to bear the guilt of this deception, Mireille braces herself for a cold and loveless life. Yet, to her surprise, Cain cherishes her deeply as his bride. Why does he continue to treasure her so sincerely despite the truth?