One day, Kageaki, the head of a merchant family, saves a deeply wounded king of another world, the Demon King, and in return receives a heavenly maiden named Juju, who lays eggs that cure all diseases. Kageaki is drawn to Juju, despite his heartbreak for his sister who is suffering from a fatal disease, and embraces her again and again. Juju, unwilling but unable to resist the pleasure, seeks her again and again. This is a story of pure love between two people whose mutually conflicting feelings eventually become one.