The No. 1 Division were spread apart because of the Terraformars. In the depths of a dark hole, the gong had rung on a battle of the Earth vs. Mars. On Mars's side, a weevil-based Terraformar and on Earth's side, was Onizuka Keiji! He had always lived a very simple life. In order to protect the island his mother loved, and to protect his precious new friends, Onizuka stands in the ring yet again. Thus begins the brutal and unrelenting battle of fists.

After being surrounded by the thread that a Terraformar with the powers of a silkworm laid out, Shokichi remembers Akita Nanao. Shokichi regrets the fact that they had to leave her body behind on Mars after they had killed her during the Bugs 2 mission. Now, he wants to get revenge. Will Shokichi be able to restart the clock that had stopped twenty years ago? Meanwhile, The No. 3 Division is within the pyramids and find something that shouldn't be there, and suddenly, a deafening sound can be heard throughout Mars.

The No. 1 Division finally comes to No. 2 Division's aid in their most desperate hour. Michelle and Akari both use their BUGS powers and face off with the Terraformars. Because they are reunited, the truth of Sheila's death also comes to light. Meanwhile, the presidents of the allied nations was meeting with the prime minister of Japan, Hiruma Ichiro. The Annex crew is about to face the true test of survival!