A prototype multiped tank has destroyed two other prototypes and broken out of a testing facility. Section 9, employing its own smaller multiped, the Tachikomas, is brought in to stop it.

The hijacker is using the ID of the tank's designer who had recently died. Whoever is operating the tank, their motives are unknown. Section 9 has little time to figure out these two mysteries before the tank enters the urban area.

Back on the Laughing Man case, Section 9 tries to find evidence of tampering in the Nanao=A case and delves more into the recent hack job at the Ministry of Health, Labour and Welfare ("PORTRAITZ"). Using J.D. Salinger's The Catcher in the Rye as a guide, Togusa checks out the MHLW and finds that something is missing: a ledger containing a list of vaccine recipients.

Togusa, at the request of Chief Aramaki, returns to work. Both head out to the Prime Minister's residence with a detailed report citing Secretary-General Yakushima as the real power behind the Laughing Man Incident.

However, before they can even leave their own building, they are told by the Minister of Home Affairs that Public Security has already been accused of being the masterminds behind the Laughing Man. The situation has gone from bad to worse and it will take a concerted effort by all of its members for Section 9 to clear itself of the charges.

A cat thief named Cash Eye has infiltrated a building owned by Federation of Economic Organizations Chairman Tsutomu Tadokoro. The cat burglar made quick work of the top-notch security system and left a calling card on the Chairman's desk saying that Cash Eye will be infiltrating his vault during an upcoming party.

Albeit reluctant to get Section 9 involved, Aramaki has no choice but to assist Tadokoro. Prime Minister Kayabuki has requested that his unit go undercover in order to prevent the burglary.

During a visit to the Dejima Refugee Residential District off the coast of Nagasaki, Prime Minister Kayabuki receives a bouquet of flowers that is accompanied by an envelope stamped with the diamond seal seen in "NATURAL ENEMY". The envelope contains a letter that promises an attempt to take the Prime Minister's life.

At a meeting of the Prime Minister's Cabinet, Aramaki is shown the letter and told that so far the stamp on the envelope has turned up in eight other terrorist incidents. The Cabinet calls for Section 9's assistance. However, much to the unit members' chagrin, Section 9 will not be deployed in an offensive role.

While Ishikawa begins to dig deeper into the background of CIS Representative Kazunoto Gouda, the rest of Section 9 are instructed to arrest one Shou Kawashima, a Taiwanese vegetarian restaurant chef who has been seen at three locations where the Individual Eleven have claimed responsibility for attacking.

The Taiwanese restaurant where he works is near the Nanyou Shimbun (Newspaper) building that had received an earlier threat against it by the Individual Eleven. Section 9 moves into position around the Taiwanese restaurant and commences their stakeout.

Following a tip, the Major conducts an undercover investigation of Kuze in Taiwan. While there, she saves a boy running from the Mafia.

After being saved, the boy follows her, making sure that she finishes what she started. The mafia will continue to pursue the boy and the Major has to protect him.

The Chief Cabinet Secretary uses the excuse of the refugees possessing 10kg of plutonium to mobilize the military against Dejima. With the available evidence against the refugees, Prime Minister Kayabuki reluctantly agrees. However, she soon learns from the Chief Cabinet Secretary that he's aligned himself with Imperial America and is now after her job.

Knowing her days as P.M. are numbered, she agrees with Aramaki's plan and calls the U.N. in for a nuclear inspection of Dejima. The move buys them some time to defuse the situation, and Section 9 heads to Dejima to meet up with the U.N in two days. However, with tensions running high it is only a matter of time before someone fires the first shot.

Kuze and the Major come up with a plan to save the refugees, but the chances of its success are slim. Realizing this, the Tachikomas disobey the Major's orders and come up with a plan of their own. Batou has also disobeyed the Major's orders to go to the bridge and is desperately searching for her in the ruins of Dejima. Meanwhile, the Prime Minister is frustrated with being spurned by the Chief Cabinet Secretary. Determined to be remembered as more than a mere figurehead, she takes matters into her own hands.