One day, fog spread all over the world. And in the fog, A monster began to appear. Do Ha-yeon quietly looked at the man in front of him. Neatly trimmed black hair, a cold, urban impression. The suit he was...

The story begins in the near future, where a social mobile network called the "Kizuna-Topia" (Bonds-Topia) controls all communication and surveillance in the wall-bound city. In this city, two sisters, Enna...