Gokaisareta "Midawari no Majo" wa, Kokuu kara Saisho no Koi to Saigo no Koi o Sasagerareru

As the only witch in this world, Lupia is gifted with the magical ability to take the injuries and illnesses of another and transfer them to herself—a secret she keeps to herself. She marries her first love, King Felix, and is deeply devoted to him, and the affection seems mutual. Unfortunately, due to a misunderstanding, Felix believes that she has betrayed him and begins to treat her coldly. After Lupia sacrifices herself to save Felix’s life, she falls into a deep sleep. Thus begins the story of a long and unrequited love, and a husband’s desperate devotion to his wife.

"Although you may forget your feelings for me, I shall always love you, and I will be sure to bring you back."