Heika Watashi wo Wasurete Kudasai

Lunia, the daughter of Count Persephone, lived a very tough life after being rejected by her father and treated badly by her half-brother. One day, a priest chose her to marry the powerful Duke of Khronoa,  Hades. He had a curse to die young unless her married someone who was selected by the emperor. Hades has no feelings for Lunia and told her he would never love her.

To save his life, Lunia spends the night with him, and then he disappears without knowing that she is pregnant with his child. Seven years later, Hades came back and found her and their child.