SHADOW manufactures a battalion of robot hogs to initiate their new campaign of world conquest using humanoid Pigmen. The repulsive automatons disguise themselves as Mr. and Mrs. Nakanishi, the owners of an electronics company. When their daughter, Midori, realizes that her parents are imposters, she seeks out Rieko and Misao. With the situation growing darker, and Ichiro overwhelmed, Rieko makes a desperate maneuver to save her friends.