Key to All and Nothing

Mahogens are a race of beings blessed with magical abilities and burdened with weight of protecting all of creation. At the age of fourteen, all mahogens will receive their Unmei no Kagi 運命の鍵 (Destiny Key) and travel to the human world to look for their soul crystals and protect the wishes of humanity. Princess Lucy has never been much of a princess and when she gets a destiny key that no one is able to identify she feels even less like she fits into her role. Little does she know that this key has tied her fate and the fate of four other princesses into a knot. A knot they must work together to unravel before a darkness comes to capture them all. All of this they must do, while navigating school, a new life, homework, boys and finding their soul crystals as well as protecting humanity from monsters daily. How will they cope?