Sergei and his commandos arrived in Japan to kill Kawamata for stealing one of Russia’s combat suits. Meanwhile, Kawamata’s limbs were replaced by the government. In addition, he began to feel sick and tired of fighting for the government and chose Iba as his successor to the combat suit. Sergei arrived at Kawamata’s home and successfully killed him despite Iba’s attempts to protect his mentor. Suddenly, another meteor appeared and was secured by Sergei’s commandoes, but in a freak accident, the meteor thawed from its confinement and the ooze infected Sergei turning him into the Combat Suit Monster and went on a rampage and ate the other commandos. Now it was up to Iba to fight this beast. The end of the movie ended in a cliffhanger, where Kawamata’s brain is preserved for study; further denying him any peace even after death.

A year has passed since Kawamata single handedly vanquished the Dad Monster and killed many innocent bystanders in the process. Although he destroyed the monster, Kawamata was sentenced to death for the massacre in Shinjuku, however, the charges against him would be dropped if he cooperated with the government and used the combat suit to fight the meteor monsters, he reluctantly agrees. While in prison, he befriended a fellow inmate named Iba; it seemed that many of the prisoners feared Kawamata or hated him., but Iba didn't fear him because he loved weapons as much as Kawamata did. When a meteor crashes in the suburbs, the parasite ooze infects a chicken which began to eat livestock and the farmer before it ran into the city. The creature starts attacking an amusement park and Kawamata is quickly dispatched to intercept the monster. During the fight, Kawamata loses a leg and an arm; struggling, he barely managed to fight back and defeat the monster.

Kawamata, a former special forces, who becomes a mercenary for hire. In this part of the story we explore the mind of Kawamata, a wealthy man and an avid collector of military weapons. The monster in Act I is called the Dad Monster, according to Buildup. This monster is a businessman who was infected by the parasite ooze when he got too close to the meteor. He slowly began to turn into a monster; first brutally killing his wife and daughter…then feasting on both them.. Finally, he fully developed into the Dad Monster and goes on a killing spree; shredding people and biting victims in half. Kawamata heard of the monster and was excited to finally test his newly upgraded combat suit. After a couple of minutes of mindless destruction, Kawamata comes out triumphant against the Dad Monster by ripping him to shreds with his trusty machine gun…however…he kills 40+ innocent bystanders in the process.