A series filmed entirely at night, the entire story begins in the darkness and ends in the darkness. The story links together the experiences of several E.U. assault team members working different night shifts. During their shifts, they already encounter all kinds of unfathomable dangers and challenges, but the true test of their endurance lies in the endless temptations that they face in the darkness of the night. With their willpower slowly weakening as the night wears on, their self-protection and restraint are also in danger of suffering serious blows.