A corrupt corporation attempts to steal top-secret national research. Betrayed by the organization and branded with the assassin codename "Kage," the lone figure, tormented by their conspiracy, halts fleeing and chooses a solitary path of vengeance. Surrounded by powerful, eerie monsters and falling into a deadly trap that awaits them, they face a life-or-death crisis. At the moment they resolve to die, a mysterious female student suddenly appears. Possessing an unbelievable special ability, she miraculously turns the tide with inhuman power. And then, everything rushes toward an unexpected finale...!?