The Thibela

Marian is a goddess that cannot stand humans but in order to save the life of her grandmother she is sent to earth to look for the Thibela, a special rock that will save her grandmother.
All hell breaks loose when she gets to earth only to find that her mother a former goddess has turned into a human and she has gotten married to another man and they have children. Marian soon forgets her mission as she plots to end the human race to avenge her sister's death caused by her mother's love for a human.