Lunia, daughter of Count Persephone, was abandoned by her father and treated as a mere tool by her half‑brother, living a solitary life. Meanwhile a priest chose her to be betrothed to Hades, the head of the Khronoa dukedom, and she opted to marry into that cursed family. The ruler of Khronoa—dubbed the "Underworld King"—is doomed to a brief life unless he marries an emperor‑selected bride. Yet Hades tells Lunia that he never intends to love her.
To keep Hades alive, Lunia deceives him, spends a night with him, and then disappears without realizing she is pregnant. Seven years later, Hades tracks her down and tries to take her back along with the child…