In the Boundary of Gensokyo, Yukari walked over to Chen, who was sitting down, playing with a ball of yarn. Ran was next to Yukari as they walked over to her. Chen heard both of their footsteps, so she looked up at the two of them, Yukari smiling and Ran looking a little more serious.

"Hello Chen," Yukari smiled, waving a 'hello' to her as well. "How are you today?"

"I'm fine!" Chen said, smiling as she picked up her ball of yarn again. "Did you come to play with me?"

"No, no," Yukari shook her head, as she kneeled down. "I have an important job for you, dear Chen. You see, people on Mars defeated people from the outside world, and i'd like you to sneak onto Mars, using my ability, and go here," Yukari said, unraveling a map she made of the area from Goki's surveillance. "Inside a cabinet in this room, there should be some sort of book that Goki, nor I, would be able to get, due to Goki not being able to pick it up and i'd be far too noticeable to steal it away. I'll be dropping you here, outside the place where this book is held. I believe it would be important for us, in case the Martian's choose to attack Gensokyo."

"Huh?" Chen asked, standing up as she dropped her ball of yarn. "An important job? For me? F-from Miss Yukari?"

Yukari smiled, bringing her hand out to Chen's face. "Yes. If you succeed, you'll be doing me and Ran a great favour, as well as many other people, i'm sure. You should sneak into the tunnel area through here, if you can. If not, wait for someone to attempt to enter or exit the room and sneak in then. We're counting on you. Remember to remain in your cat form unless it is absolutely necessary for you to transform back, or when you find the history book."

"O-of course, Miss Yukari!" Chen smiled, as she transformed into her cat form. Yukari stood up again, as she opened a gap beneath Chen, waving goodbye as Ran did the same. Goki flew through a seperate gap Yukari created in order to keep an eye on Chen. Once the cat left, Ran turned to Yukari.

"You purposely didn't mention about that part of the plan, didn't you?" She said, looking down to where Chen once was. Yukari smiled in response.

"She shouldn't think that of part of my plan, and merely a happy happenstance that she happened to overhear such things. There's no doubt in my mind that they'd do that, with the fact they run on Ministries," Yukari explained, before walking into the house that her, Ran and Chen lived in. "Keep an eye on her through Goki for me. She's your Shikigami, after all. Tell me if she needs a quick evacuation."

Ran nodded, looking upwards towards the sky. 'I hope you're right about this, Yukari.' She thought to herself, as she accessed the eyes of Goki in order to make sure Chen stayed safe.

Chen was dropped in a barren area of the Martian City, where Yukari must of noticed it had no purpose and therefore, nobody would notice her there. Chen looked around, slowly pacing towards alleyways and creeping closer to the mansion that Yukari had set as a destination point for her, as if she were a normal alley cat. The surface remained a tinted red colour, as the buildings were grand, even if they were only for one or two low ranking residents. Through the alleyways, Chen could see people who resembled humans, however tended to be taller than the average human, or human-like Youkai from earth. It appeared to be a well populated city, and rightfully so as it appeared to be the only city Martians could use as residence.

'Wow…' Chen thought, in astonishment of the people she saw and the architecture of another planet. She shook herself off, as she continued making her way around the city, towards an even larger and grander place than the city streets, situated roughly in the middle of the city. It appeared to be a palace, where life would provide all one could possibly need just by living in there. The outer walls had towers scaling up, and gates on every side of it. Chen walked towards one of the gates, the eastern gate, and slowly peered her little cat head around the corner to look in. Nobody was there.

She smiled to herself, as much as a cat can appear to do so, and squeezed herself through the gate, still going unnoticed by the martians. She looked around the square-shaped courtyard, as it had patched of luscious plants that appeared out of the world she had known. It all looped around to other gates, that she could also have just as easily squeezed herself through. She walked towards the grand palace, looking for the open window of a kitchen that Yukari had told her to go through. Upon finding that kitchen window, on the other side of the palace, she lept inwards. Nobody was there.

Goki flew in after her, and flew up some sort of air-vent looking place at the top of the kitchen. Chen managed to make her way up and into it, as she was relieved her jumping hadn't lead her to a vertical shoot downwards that she would fall through, but rather a diagonal place she could easily walk up. 'Yukari said the room is just at the end of this…' Chen thought to herself, as she proudly paced forward and up to the room she was designated to go to. 'This seems to be a diagonal shoot for sliding messages down… like someone in the room would order food by sliding the order down here into the kitchen. How convenient!'

At the end of the shoot, Chen quickly staggered backwards, before composing herself and looking through the other end. The room was large, and had a round table in the middle to seat five. There was a cupboard-like thing opposite the door, which Yukari had marked as what Chen needed to go to. However, around the table, five people were seated, having a discussion that Chen could barely overhear. One of them was a relatively tall girl with lavender hair, another was slightly shorter and sported long, brown hair that seemed to be kept in pristine condition. The one on the other side of the one with pristine, brown hair was a much shorter girl, with short, light green hair and golden eyes that Chen could make out even from up where she was. Next to her was a girl, around medium height with long, red hair. And finally, the last one was a girl with blonde hair down to her shoulders.

"A human spy, you say?" The one with brown hair asked, looking at the lavender haired girl.

"It appeared that way," Saiko said in response, looking at her. "I apprehended her out of suspicion, before Hiroko insisted I let her speak with her. I have no idea how she managed to get onto this planet without a rocket ship."

"I do," Hiroko responded, smiling. "And she wasn't human. She was a youkai of boundaries, who likely opened a portal on the surface of our planet to make her way here. She appeared to be coming here out of curiosity for our other planet, rather than any malicious, spy means."

'Youkai of boundaries…' Chen thought to herself. 'She means Yukari! So Yukari knows these people?'

"Still, without doubting your intellect, I believe we should facilitate ourselves as the dominant beings in this scenario," The fiery haired one said, yawning slightly as she did. "This is the second time within three days people from that planet have come here, it's like they believe they own the planet."

"Well, the city is invisible, in case you forgot," Hiroko reminded her. "They didn't know we existed in the first place. I believe this no means to attempt a war against their planet."

"I found some sort of satellite orbiting the planet, much like our two satellites orbit our own," the brown haired one said. "Perhaps it is beneficial to start there. By waging a war against them, we get more ground in the solar system, and any other beings out there will begin to fear us. Isn't that what master set us up to do? Conquer space so she can rule it as her own? So far, we've done nothing but observe."

"This is our chance to do as master wants us to do," The fiery haired one said. "Our troops have been training for years, centuries even! How long do you expect master to be fine with us sitting around and doing nothing in her name?"

"I do also believe this is a chance we ought not to miss," the blonde one finally perked up. "As Minister of Resources, this is one strategic advantage for us. With our troops closer to the Earth, we'd be able to find any resources they may use against us, and strategically prepare our conquering of the vast reaches of space. With Kaiya's ability, we'd be able to strike the people of that satellite off-guard and easily conquer them."

"Well… it appears my choice is outnumbered," Hiroko sighed, resting her head in her hand. "Though, we do not know the power of the people who live in that city on that satellite. If you do wish to attempt to conquer that satellite to gain a more close proximity to the Earth, consider the fact that they might have people on there that exceed even our own power. The Youkai of Boundaries seemed to be close to matching our power, who knows what the satellite could have in store."

"Well, i'll be ready to evacuate everyone should the need arise," The brown haired one, who was assumed to be named 'Kaiya' by Chen, said. "Even if her power comes close to matching us, Kasumi far exceeds all of our strengths, and she is the one we will be sending to the satellite, I presume."

"Well, I believe that's settled," Hiroko sighed, standing up. "Looks like we're finally making our move after one-thousand, two-hundred and thirty-eight years. If we do lose, however, don't say I didn't warn you."

With that, all five of them left the room, leaving Chen alone in the shoot. 'They plan to take the moon in… a war…' She thought to herself, worried of what might happen before shaking it off. 'No, Yukari will know what to do to prevent them. Everything will be fine!' she smiled as she jumped down into the room, reverting to her humanoid form as she opened the cupboard and took the book out of it. "History of the Invisible City…" she whispered out loud. "Wonder if this will help Yukari in stopping the Martians…"

As she said that, a gap opened behind her, as Chen nodded and quickly hopped into, proud of her success in finding what Yukari wanted. She emerged on the other side, as did Goki as it flew through the gap as well, still with the book in hand. "I did it!" She smiled, proudly holding up the book as she exclaimed her success. Ran appeared proud, stroking her head as Yukari took the book, looking a little more serious as she had overheard the Martian's plans through Goki's ears.

"Well done Chen!" Ran seemed excited for the cat girl also, as Yukari smiled in response to Chen as well. "I'll ready your treat later. Right now, me and Yukari must discuss something."

"Oh, okay!" Chen exclaimed, walking off proudly as she left the two of them alone. Ran's smile lingered for a second, as she turned to Yukari.

"What do you intend to do?" Ran asked, as Yukari set the book down for later reading.

"Warn the Lunarians of oncoming threat," Yukari replied, standing up as she looked over to Ran in the same motion. "The Martian's seem to have the means of reaching the moon whenever they want. Thankfully, I can also reach the moon as I please thanks to my ability. I will warn them of the events to come, although they may not appreciate me being there at first."

"I see…" Ran said, nodding to the fact.

"I'll emerge at the Sea of Prosperity again. Best case scenario, one of the sisters would be able to notice me there," Yukari said, as she opened another gap in front of her. "You should get around to treating Chen," She said, as she walked through the gap. Ran nodded, as she went out of the room.

Yukari emerged above the Sea of Prosperity, as she looked around for anyone that may be there. 'Looks like I'll have to fly my way to the Lunar Capital, then.' she thought to herself, as she began flying over the Sea and towards solid land. Shortly after crossing the seas, she heard a voice that she recognised.

"You're here again?" It said, as a blonde girl, holding a fan, walked over to her. "Don't tell me you expect to be able to get into the Lunar Capital and do any stealing, right? You didn't even bring that nine-tailed fox along with you."

"Ah, Watatsuki no Toyohime," Yukari smiled. "I thank you, you have made my job here much easier."

"Oh?" Toyohime asked, gripping her fan with her left hand to stop her moving it. "Please, elaborate on what this job you have here is."

*Spell Card!* World and Character Insight!

According the the Martian's book of history on the Invisible City:

The city was founded under one ruler, and that ruler assigned certain jobs to five of her strongest and closest allies, creating the five Martian Ministries of what the Invisible City foundates on: The Ministry of Chemicals, The Ministry of Discovery, The Ministry of Intelligence, The Ministry of Resources and the Ministry of Battle. The people she entrusted these rankings upon to are as follows:

The Minister of Chemicals: Saiko Kurosawa. She is rather serious of her high ranking among the Martians, and her cautious and cold personality reflects her desire to keep the Invisible City safe. She has the ability to Manipulate Chemicals using Germs, allowing her to place any Chemical to serve any purpose upon anything she touches with her hand.

The Minister of Discovery: Kaiya Amari. She was placed in charge of discovering new planets for the Martians to conquer under their Master's name. She is possibly the most loyal to her master, not doing as she does for any personal means outside of curiosity. She has the ability to instantly transport as many people as she pleases to any area in space.

The Minister of Intelligence: Hiroko Amagai. As the smartest Martian, she was given the name 'Supernatural Mind' by many people. She is mostly in charge of finding out about the planets that Kaiya discovers, as well as being the only Martian, even among Ministers, to have known contact with the Master of the Martians. She has the ability to instantly know anything about someone upon direct eye contact, however she only knows about them, not about what things they've done are.

The Minister of Resources: Yorimi Kawakami. Was entrusted as the Minister of Resources due to a lifelong fascination with different materials and what their uses could be. Her motivation for wanting to seize the moon was related to this fact, as she wanted to know what she could find on the moon and, by extension, on Earth. She currently serves as the Weapon Administrator for the Martian Army, due to her ability to combine materialise to instantly create anything she desires out of those materials.

The Minister of Battle: Kasumi Tadeyuki. As the 'Strongest Martian' outside of their master, she was entrusted to lead the wars to conquer the different places within outer space, however has never gotten the chance to lead such a war until now. She has a fiery will for battle, as well as being incredibly skilled in swordsmanship. She has the ability to summon familiars for battle, and also the ability to use said familiars to enhance her power further.

These five were entrusted to keep stable control over Mars, such that the Martian residents begin to make conspiracy theories about whether there is a master of the Martian's or not, including Kasumi being slightly skeptical. The only person who 'Knows for sure' to them is Hiroko, as she is recorded to be the only person ever to have spoken to, or interacted with this 'Master' in the history of Mars.