Demigods were the off spring of a God and a human called. Son of Hades, Son of Zeus, Son of Poseidon, Daughter of Athena name all the Gods; for well you can tell they all have siblings that is living on earth land.  Here on earth there is a secret school that was hidden from humans and other creature to keep them safe and sound.  Chryseis the daughter of Aphrodite a simple girl who lived in the human world, an innocent young woman who didn't know that she is a demigod.