It's about a girl who gets a mysterious package, which happens to be a large egg. When the creature hatches, it thinks that the girl is it's mom. Then later an unfamiliar boy comes and says he has a note telling him to come see her. When it sees the boy, the creature thinks the boy is its dad. Suddenly the girl becomes a naga and the boy becomes a dragon. (The creature is some kind of hybrid, if you are wondering). The girl and boy get on with life while taking care of the creature. Then they realize they have to protect the creature because there are dangerous creatures that want it, dead or alive.