For over 500 years, a group of enigmatic white-haired children has been spotted at various times and places across Europe. They always appear to be 11 years old, behave far more maturely than expected, never age, and seem to possess supernatural powers. Their quest is to find a girl, and the only clue they possess is a picture featuring a crescent moon. Now, in 2012, an athletic boy named Tohma is about to become entangled in this centuries-old mystery.