Kuroshoubi no Majo wa Kogane no Ouji ni Ubawareru

A gothic romance of pure but forbidden love. Surya, the second prince of the Empire, met the lady Ariane, who people called the Witch of the Black Rose, in a mansion hidden deep in the forest along the border. Surya was fascinated by the mysterious beauty and visited her again and again, until they gradually began to connect with each other... (Source: Missy Comics, translated)