Shun's eyes were filled with fear, he was breathing fastly, and he was trembling. Everyone in his hometown turned into Invaders. Shun finished the Invaders off with his Vacuum Missile. He became anguished when he realized he killed innocent people lying on the ground — including his mother and sister.
Shun woke up from his nightmare, breathing fastly. (Episode Title)

Ruriko and Shun were walking on their way to Tategami School. Ruriko noticed that Shun was quiet so she talked about tomorrow's landing of Apollo 11 on the moon. Ruriko asked if animals can live on the moon especially rabbits, but she noticed that Shun was still quiet. Ruriko tried to convince Shun that Mr. Fukuoka was an Invader. Shun bitterly noted he did not care about it. Ruriko noticed their classmates, Isogai and Takanashi being abused by motorcycle goons. Ruriko called Shun's attention. Shun rushed to rescue them, but stopped when he imagined the goons to be Invaders. Ruriko offered to do it herself when she noticed Shun's withdrawal. As Ruriko ran to rescue her classmates, a boy of her age appeared to rescue them also. The boy had pale skin and had a pale grayish-green hair. The pale boy told the girls to run and said he would take care of goons. The boy threw his coat to the air, punches were heard, he was still standing when he caught his coat back, but after that he fell to the ground. The goons laughed at the boy and remarked he should not have acted cool. Ruriko came to the boy, and so did Isogai and Takanashi. Isogai and Takanashi apologized and thanked the boy. Ruriko asked Shun to help them get the boy up. The boy told Shun why he did not offer a hand when he was watching all along. Shun, was bothered by what the boy just said, so Shun suggested bitterly he should not have tried to beat the goons if he only wanted to look cool.

AEGIS Intelligence reported to Shirei about Yasutaka Fukuoka. The intelligence told Shirei that Fukuoka never existed, but his citizenship and school certificate were found. Shirei thought Fukuoka could not have done it himself. Shirei concluded that Fukuoka was born as a teacher in the society. Shirei asked for Miss Ochiai's report, and Miss Ochiai reported that according to students Mr. Fukuoka was a..., Shirei completed her sentence, "...a jerk.". -_-

Class 2-A students talked about Mr. Fukuoka's disappearance. Rumor said Mr. Fukuoka quitted because of family matter. A student commented that it was good Fukuoka was gone because he favored people. Megumi and Shun were quiet in their seats. Their teacher came in and introduced a new student. This new student was a transferee that came from different places. Ruriko, Isogai, Takanashi, and Shun recognized him. The new student was the pale boy awhile ago, and he introduced himself as Reiji Kageyama.

In Tategami rooftop, the girl GateKeepers were talking about Reiji. Fei asked Ruriko if this Reiji was that new cool guy in school. Ruriko told them that Reiji was good in everything, he was smart and was good in sports. Kaoru asked Ruriko if he was better that Shun. Ruriko asked back why Kaoru was bringing the question up when Shun was not with it. Kaoru noted that Shun was still upset because of the Fukuoka incident. Ruriko remarked that Shun should be strong because Invaders were only machines in human form. Megumi, who was a distance sitting away from them, spoke up that Mr. Fukuoka was the only one who understood her. Ruriko asked Megumi why she joined the Gate Keepers, and Megumi replied she would never allow her to get better any better. Ruriko asked Reiko what she thought of it, and Reiko only said "yes" while sleeping. (Sou desu ne...Sou desu ne...)

Shun was alone leaning on the wall and was watching student activities. Shun thought he should have joined a club. Reiji showed up and told Shun that he was looking for him. Reiji commented that it was hot, and Shun said it was because of summer. Reiji really meant Shun was hot — hotter than boiling magma, the sun that shines in the sky. Reiji continued that Shun was losing himself, he was running away because he was not confident in his mind. Shun yelled at Reiji to stop it. Reiji would not stop so Shun attempted to punch him. Suddenly, a baseball came to their way, but with Reiji's fast reflex he caught it — without looking! Reiji threw the ball to Shun and apologized that he said too much. Shun looked at the ball in his hand and realized Reiji was faking it (the losing to the goons thing) awhile ago.

The office of the principal called for the special members of the class (AEGIS distress call). Shun was late and Ruriko scolded him. After some arguments, Shirei told them of their new mission. Invaders were in the oil refinery in Kawasaki. Miss Ochiai showed the mapped areas that would be affected when the factory would be destroyed. Shun reacted that it was near his home. Ruriko requested Shirei to let her take the lead because Shun was emotionally unstable. Shun insited to Shirei that he would do it, Ruriko and Shun argued over it, but Shirei decided that Shun should take the lead.

Shun drove his UP-15, while the others were aboard the AEGIS Bus, and following them was a helicopter that carried the Gate Engine.

After a while, Shun had finally arrived in Kawasaki Oil Refinery and saw a bus stumbled on its side. Shun saw a group of black Invaders so he prepared for an attack. Shun was kept back when he saw the goon's motorcycles (owned by the goons we have seen) lying on the ground. Shun started to imagine Invaders as innocent people. A red Chainsaw appeared and commanded the group of black Invaders to combine the nuclei. Shun walked forward to stop the Chainsaw, and noticed he was stepping on gasoline. A boy (it's Reiji!) who wore sunglasses appeared from the top of a building. The sunglasses-wearing Reiji never gave his name to Shun, saying he never gave his name to jerks. Reiji even added that he was a jerk who could not shoot an enemy. Reiji commanded the Chainsaw to kill Shun. As the Chainsaw approached Shun with its cutting side, a barrier protected him and the Chainsaw's sharp edge broke. The Gate Keepers party had arrived, and Megumi who was on the Gate Engine chuckled as she had proven herself better than Ruriko in that situation. Kaoru hit the Chainsaw's face with her Dash and Kick until it revealed the red Invader, Ruriko followed with her Arrow of Light damaging the red Invader more, and Fei ended the red Invader core with her Fire Panda. Reiji (who was still unrecognized by them -- what poor eyesight Gatekeepers! ^_^;) announced that the bugs had finally arrived. The Gate Keepers persuaded Shun that the villain was only an Invader, a machine that looked like human. Shun agreed with them and was ready to finish their villain. To their surprise, Reiji opened a black gate and attacked them with black edges he called "Shadow Edge". The Gate Keepers were shocked to realize that their enemy was human, after all only special human beings had gate abilities. Reiji told them that if they were GateKeepers with AEGIS, then he was a GateKeeper with the Invaders. Reiji mocked Shun to kill him, and revealed a lighter in his right hand. Reiji told them that they were only ants and he would burn them. Shun was greatly angered and told Reiji that humans or Invaders, he would not tolerate anyone who did not value life. Shun started to open his gate in his Vacuum Missile stance. Reiji walked a step backward while he held the lighter steadily in his right hand. Vacuum Missile zoomed to Reiji's location. The lighter broke but Reiji was still alive. Reiji laughed evilly and told them that he was looking forward to meeting them again. By the time Reiji meets them again, he would expect Shun to put a hole in his chest. Reiji walked out of their sight laughing. Shun uttered to everyone that he was a failure. Ruriko disagreed and told Shun that he did the right thing because it was their duty to protect mankind. Shun blushed and uttered "Rurippe..." Ruriko walked to Shun and softly touched his cheek then pulled his cheek harshly because he called her Rurippe again.

The next day, girls gathered around Reiji who was injured. Reiji told them that he saved someone again so he got injured. Shun saw Reiji and walked to his direction. The girls did not like Shun's presence. Reiji greeted Shun and walked to him also. They apologized to each other (Reiji apologized that he said too much). Reiji offered a handshake with his injured right hand. Shun noticed that Reiji's right hand was injured so he offered his left hand instead. Shun's left hand touched Reiji's pale left hand, and they both smiled at each other. The episode ended with the historical first step of Neil Armstrong on the moon [Date: July 21, 1969].