Neylia, a country of magic and spirits, is at the verge of destruction. According to a myth in the country of Neylia, 700 years ago, the creatures of the underworld were summoned by the Dark Wizard and roamed the world, creating chaos and many people to be possessed by a Shiryo, a soul of the dead that has entered the underworld. A living human can only be possessed by a Shiryo when they harbor vengeful feelings and make a contract with a spirit of the dark. The contract between the human and the dark spirit is that in exchange for three wishes, the human must give their soul to Izanami, the Goddess of Death. But these horrific days came to an end after the dark spirits were sealed away by Izanagi, the God of creation and life, and the peaceful days resumed. However, to prevent certain events, the Black Knights Council was established to maintain peace and order, and alongside it the Black Knights Academy, a magic military academy where generals of the Black Knights Council train and discipline younger generations who will become future soldiers and serve the country of Neylia. These trainees undergo harsh training to strengthen their abilities, and only the strongest ones receive missions and rise to positions. Amongst this, a couple of spies have snuck in and manipulated a certain group of people within the Academy's council as they desperately search for the lost key. In the group of trainees, two children of two Council Members have a complicated relationship and excel among others, but somehow get themselves tangled into this mess and is ordered to stop these spies.  Moreover, the seal of Izanagi is weakening for some unknown reason, causing serious problems in Neylia. Who will rise as the victor amongst this chaos? Will these two people rise from Earth and protect the Heavens? Or will darkness consume the Heavens  and Earth again?