Arte and Amelia have always been different from everyone else. They share thoughts and dreams. They see the strands of time and fate in ways others don’t. And they might be over 10,000 years old, but they don’t look a day over 21. The thing that bothers them the most? They don't seem to feel the same things others do - not happiness nor grief. They may have seen the birth and death of generations around them, but none of it means much to someone filled with emptiness. Their mundane day jobs give them a place in a constantly changing world, but by night the brother and sister duo run a supernatural investigations agency in search of answers not about the world, but about themselves. Who are they? What are they? When they find their truth, however, the new questions lurking underneath it might be far more frightening than those they started with. Some answers are better left unknown.