"If he is death himself then I'll be his shadow... and I will be the one to destroy him." A girl named Eris Thana Fleas from Tenebrae-Kingdom of Darkness or also known whereas monstrous creatures resides, is the holder of the forbidden element called 'Dark Arts'. As the person who's destined to die, she decided to change her fate by stepping on the ground of Lumiere-Kingdom of Light. In order to fulfill her goal, her search for the Lost Crystal begas as she enroll in Light Academy and meet Kei Delvin Synivia.