Akuma To Duet
Other names: 悪魔とデュエット, 惡魔契約, Duet with the devil
Author: Fujitsuka Yuki
Artis: Fujitsuka Yuki
From HaruHime: Due to her ability to tame demons, Mel has been persecuted as a witch all her life. One day, she's summoned to the castle and asked to marry Prince Claude. But Prince Claude is actually...! Contains an Extra.