Fifteen-year-old witch twins Hiroshi and Amaye Karugame, born with dangerous split personalities stemming from genetic defects, were raised in isolation by their parents, unaware of their true nature. Their sheltered existence shatters when they awaken to find their home destroyed and their parents turned to stone statues on their fifteenth birthday. With no memory of the incident and lacking the magical skills to reverse the spell, the twins must venture into the outside world for the first time.

Within a world dominated by the vilest of creatures and masters of the arcane, they will face unforeseen dangers and uncover secrets about their world as well as themselves, relying on each other to navigate a landscape filled with both the unlikeliest of allies, adversaries and demons sleeping within them.