Demon duke x Lunatic Souler

Lune is a metrist who comes from the city of Vuryta in Keanazella, a very large and developing capital at that time. One day, Lune was assigned by his leader to capture the demon duke who was also a soul stone smuggler. Lune disguises herself and ends up falling in love with the demon duke. Then what will happen? Will the Demon duke repay Lune's love? Or instead he would kill her to make an offering to Lucifer? Will Lune continue to do her duty to serve Vuryta and ignore her feelings? Find the story here