To escape a forced dragon marriage, Elf princess Elvira seals her power and flees to the human kingdom, accidentally forming a life-bond contract with Prince Cain, heir to the Warrior God's bloodline. Posing as a maid, she uncovers the truth behind her parents' imprisonment and joins Cain to fight Duke Gregory, who plots with dragons to revive the Demon Lord. Discovering she is the seal's core, they sacrifice their souls, defeat the enemy, ascend the throne, and purge the demonic energy. Yet at their daughter's birth, has the poison truly vanished for good?