Fighting the Gods

Nocens is the daughter of Hades, the God of the underworld. She lives with 3 other people who are also children of God's. They're job is to stay un-noticed, looking after the humans until their parents contact them with a mission. One of these missions send the group to Germany, where Nocens meets the guy of her dreams, although him and Robin don't seem to get along... Nocens is then forced to choose between them when they both get kidnapped, and Nocens has to either go the the bottom of the sea, to battle Poseidon to get her boyfriend back or go to the underworld and battle her dad, to get back Robin. Choosing has never been harder.