Gate Keepers were having a terrible fight against Invaders in Kaminarimon Gate. Shun attacked with Vacuum Missile, Ruriko with her Arrow of light, and Kaoru with her Hustle. Reiko was about to play the piano but it got smashed (again) by a huge Invader Lantern. Everyone was fighting the Lantern poorly and Reiko demanded for another piano. (episode title)

After the battle, Gatekeepers reported back to the base. Shirei commented that they have defeated Invaders in a poor manner. Shirei came up with an idea to assign a captain that would lead them strategically.

'TAICHOU (captain) ?!' Ruriko was in deep thinking. Ruriko thought that she could not be captain because she was a member of the student council.
'TAICHOU!?' Shun also thought of being a captain.
And so was the non-Gate Keeper Megane.
Reiko broke all their thinking and suggested the the first GateKeeper, "Ruriko-san", should be the captain. Ruriko told Reiko she could not (although she wanted to be captain) because she was leader in various clubs, and president of the student council. Then Kaoru spoke up and suggested that "Ukiya-senpai" should be captain. Shun also told Kaoru that he could not be captain because all he could do was cut through an enemy. Ruriko agreed with Shun. Kaoru asked Ruriko-senpai if she did not really want to be captain. Of course deep inside Ruriko was a want to be captain. Megane volunteered for himself and claimed that he can formulate well-thought plans with his genius. Bancho followed Megane's volunteer, and all of them started fighting over who would be captain. Shirei had enough of their fight so he decided that the voting would be moved next week.

In Class-2A's room, Shun recalled two of the policies of AEGIS but forgot the third one, thanks to Bancho's loud snoring. Shun jumped from his seat and quickly woke Bancho with a punch. Ruriko thought that if one of them ended as a captain, Gate Keepers would be doomed.

In the school grounds, Kaoru performed a high jump while thinking on how she could help Shun to become their captain. Megane, who was jogging behind his classmates, seemed to know what Kaoru was thinking. Megane imagined "Super Kaoru" jumping over the Tokyo Tower. Megane thought that if he would be the captain, he could make Kaoru conquer the Tokyo Tower. Megane laughed at his thoughts and ended up crashing into the soccer net.

After school, inside a female dormitory, Kaoru thought of the wonderful bath she just had. Kaoru noticed her dorm mates talking about something. When Kaoru's dorm mates noticed her, they quickly headed back to their rooms. Kaoru did not like it because she felt she was not welcomed just because she was new in the dormitory.

Reiko was sleeping in a big bed *in a big room* (her parents must have paid big cash for a big room in a dorm) when she heard a loud noise from the outside. She went out to check and happened to meet up with Kaoru. They had the same ideas that a strange thing was happening in their dormitory. They came up with the idea to open the window and check what was happening outside. Kaoru was about to open the window when Senior Shimamura (a senior student, head of the dormitory) stopped them and warned them not to go to Room 104 because it was the FORBIDDEN ROOM. Having heard of Senior Shimamura's warning, Reiko and Kaoru screamed in fear.

The next day, in Tategami rooftop; the Gate Keepers, Megane, and Bancho were discussing about the strange things that happened in Violet Dormitory (the dormitory of Kaoru and Reiko). Megane pressumed that the Invaders must have discovered that their base was right under Tategami School. They hope that this were not true. Kaoru looked at Shun and thought that if she would be able to make "Ukiya-senpai" solve this dormitory case — Shun would be captain. Megane and Bancho thought the same, but not making Shun as their captain — but themselves.

After school, Kaoru took the girl-dressed Shun to her dormitory. Shun hesitated but Kaoru just wanted him to be captain. Kaoru remarked that Shun looked cute in his girl outfit. Shun told Kaoru that her remark did not make him more happier. (hehe) Megane and Bancho (who were hidden in a bush) overheard their conversation and envied Shun because Violet dormitory was a forbidden flower garden to boys. They combined forces and planned to infiltrate the dormitory at night.

It was already night time when Reiko took Ruriko to her dorm. They headed straight to the forbidden room. Ruriko noticed that the room was the only one in that side of the corridor and the door was different from the other rooms. Ruriko decided to check inside but Reiko thought twice. When Reiko agreed, Senior Shimamura appeared and told them that they should go inside their rooms. Senior Shimamura noticed that Ruriko was not from the dormitory. Ruriko explained herself and said she needed to check the inside of Forbidden Room because something was strange. Senior Shimamura insisted that they should go away. Suddenly, bright light flashed through the door's small opening. Ruriko wondered what was it and asked Senior Shimamura to let them check it. Senior Shimamura said it was nothing and when the light flashed again, she yelled at Reiko and Ruriko. When Reiko and Ruriko were gone, Senior Shimamura whispered through the door's opening that it was time to change their plans.

Bancho and Megane climbed to a window with Megane's portable ladder. Kaoru entered her room where Shun was waiting. Kaoru removed her jacket and Shun thought she would be stripping off her clothes! Kaoru just removed her jacked to reveal the snacks she got downstairs. Kaoru put the snacks on the floor and started eating. Shun sensed something strange so he opened the window and saw Megane and Bancho. At almost the same time, Ruriko and Reiko opened the door and noticed Megane and Bancho in the window — and Shun dressed as a girl! Ruriko yelled at them. Megane and Bancho fell from the window with the ladder while Shun held the window panels to stop himself from falling.

Later, at Reiko's room (its a bigger room and there's a piano in the background), Ruriko lectured Megane and Bancho that they were not allowed to break in without permission. Shun tried to back up Megane and Bancho but he was scolded himself. Ruriko decided to check Room 104 by herself.

Ruriko went to check Room 104, and as she opened the door she screamed.

Everybody was playing cards as they wait for Ruriko. Megane shared a story of a movie about aliens exchanging bodies with humans, so he suggested that maybe the same thing happened to Ruriko. After a while, Ruriko came back acting strange. Shun approached Ruriko and asked what had happened. Ruriko just answered that she wanted to get some sleep. After Ruriko went out of the room, Kaoru said she might not be Ruriko. Megane volunteered to check Room 104 and told Shun that if something happened to him, he should take over.

Megane admitted to himself that he just talked big and he was actually scared. Megane trembled as he approached the forbidden room. When he was about to open the door, Ruriko appeared and invited him to come with her and be one of them. Megane screamed in fear.

Shun heard Megane's scream. The remaining of the Gate Keepers party went outside. Shun asked Kaoru and Reiko to check the rooms. When Kaoru and Reiko came back, they reported that no one was there. Shun decided to check the forbidden room. Bancho asked if they really have to. Kaoru and Reiko agreed with Shun so Bancho was forced to join them because he did not want to be alone. On their way to the forbidden room, someone grabbed Reiko. A bit later, Shun noticed that Reiko was gone. As they move further, someone also grabbed Kaoru. Bancho noticed that Kaoru was gone too. Shun prepared for a revenge battle, he opened his gate right in front of the Room 104. When the door opened, Shun alertly took his gate back. Shun and Bancho ran outside and asked each other if it was ambush. Girls gathered around them and greeted them "Welcome to Violet Dormitory!" Then, the girls noticed they were not Reiko and Kaoru and they were boys! Ruriko appeared and told Bancho and Shun that they had ruined the party. Senior Shimamura explained that they always prepare a welcome party to those who were new to the dorm. Shimamura only warned Kaoru and Reiko not to come to Room 104 so as not to notice the preparations. Shun asked who gave the idea that they were Invaders. Megane (who was in charge with the confetti) admitted it was his idea and apologized from the top while constantly dropping the confetti. Ruriko explained to Shun that she asked Megane to help out. Shun asked Ruriko why she did not tell him about it. Ruriko told Shun he may tell Reiko and Kaoru about the secret party accidentally. Shun told her that he did not want the feeling of having all of them disappear at once. Ruriko noticed the sincereness in Shun's face.

A week had passed since Shirei's decision on voting for a new captain. It looked like Ruriko, Shun, and Megane were nominated. Megane cried because there was only one vote for him (he voted for himself ^_^;) and both Ruriko and Shun tied. Shirei revealed another vote for Shun so he was made the captain. Shirei congratulated Shun and everyone applauded for the new captain. Shun thought Bancho voted for him so he thanked him. Bancho confessed he voted for "Princess Ruriko". Ruriko took the elevator and Shun noticed her. Shun realized that Ruriko voted for him. Ruriko walked away from Tategami campus, happy with the right thing she had done.