Kaibutsu to Iwareru Koshaku kara Dekiaisaremashita

"I've waited so long for this day..."

Leila Ferry was born to a noble family, but lived her life without any healing abilities that other nobles normally have. One day, a man Allen Stanley came to her house wearing a mask concealing a terrible curse. The two begin to talk to one another and grow friendly. As feelings develop, Leila begins to think, "If I had healing abilities I could help you...!" Suddenly, in the heat of a moment, a bright light shines forth...!

(Source: MangaPlaza)