Rumia, Eirin and Kaguya spoke for a period, before Eirin said something.
"There is something that worries me, however. The keeper of the Border between the Moon and the Earth doesn't have the power to send people from the Moon to the Earth, without her also passing through, to keep the portal stable. Yet, I would be aware if she was on the Earth. She is the only one on the moon who can enable travel to the Earth as well, without transport. However, transport wouldn't be able to enter Gensokyo." Eirin said.
"What does that mean then?" Kaguya asked.
"It is simple. Someone within Gensokyo is helping the Lunarian Rabbits reach Earth. However, I cannot be sure who would do such a thing. Everyone is aware of the danger that the Lunarians would pose to all in Gensokyo. Doing such would lead to nothing short of the genocice of Gensokyo's inhabitants." Eirin said.
Rumia facepalmed.
"You just said Genocide, right?"
"Yes." Eirin said. "Why?"
"Well, unless it's Yuuka bringing the rabbits to Earth, I can only think of one other person who would be wanting Genocide. She's probobly got the technology to achieve such a thing as well. The problem is, no-one knows where she is..." Rumia said.
"You're not talking about that mad scientist you fought about a year and a half ago..." Eirin said.
"Yes. It's probobly her." Rumia said. "I've got to find her, and warn everyone. She's a complete nutcase."
Rumia flew out of Eientei, and Reisen followed her, to direct her out of the forest without getting lost. Rumia then flew right towards the Misty Lake, to warn her friends first.
"Guys! Guys! We found something awesome!" Sunny Milk said to Cirno and the others.
"You guys just want to lead us into some prank, don't you?" Daiyousei said.
"No! We found something that's awesome and dangerous and we need to tell Rumia!" Star said, excitedly.
"You said if we find any bad guys to tell her, right?" Luna said.
"Rumia's out solving an incident... she wouldn't have time for your games." Wriggle said.
"Hey! I'm up for beating up bad guys!" Cirno said happily.
At that moment, Rumia flew into the group.
"Guys! I think Rika's involved!" Rumia said, panting. "I also found Kogasa, she's at Eientei, resting."
"Rika?!" Wriggle and Mystia exclaimed.
"Wait, that's what the mean lady we found said her name was!" Sunny said.
"Are you sure? I thought she said Beaker." Star commented.
"No, it was certainly Rika." Luna added.
"Wait, you found Rika?!" Rumia asked.
Sunny nodded. "We were flying through the forest when Luna wasn't paying attention and hit a tree. Except she went right through. The tree was fake! Then Star used her power and found out all the trees were fake, and there were two objects in the center of the area without trees."
"One was the mean lady. We got close and she tried to stuff us into a cage!" Star said.
"But Sunny's smart and made us invisible!" Luna chimed in.
"The other object... I don't know what it was. Rika was talkin' to it, and there was a voice talkin' back to her, about 'rabbits' and stuff. Sounded like Rika was makin' a deal." Sunny said. "Some sorta deal to do with humans livin' or somethin."
Rumia sighed.
"She's helping the Lunarians as a deal. They spare the humans, she helps them. They kill all the youkai, Rika gets her Genocide." Rumia said. "That madwoman, she's a youkai herself... she's basically committing suicide..."
"Luna, Star, Sunny, one of you lead us to that clearing, the other two go get Reimu! This is a major incident!" Mystia said.
"Wait... Yukari told me not to get involved..." Rumia said.
"Forget that! Rika's your problem anyway! You spared her life!" Wriggle said. "If she's causing trouble again it's up to you to stop it!"
"Since when was Yukari your boss?" Cirno remarked.
Rumia chuckled.
"I guess you're right. I can deal with a verbal lashing from Yukari later, what matters now is stopping Rika before she calls down the whole Lunarian Army or something."
"I'll go with those guys! I can hide myself after all if things get too rough. You too get Reimu!" Sunny said to Luna and Star.
The two other fairies nodded, before Sunny turned to Cirno.
"Don't think you're number one just 'cause you grew!" she chuckled.
"I'll think I'm number one thanks to that Fairy War you guys started." Cirno said.
"Aw don't remind me." Sunny said, before she flew off.
The site wasn't far from the Hakurei Shrine, the trees were clearly fake, as Sunny claimed, Rumia and the others could pass right through them. They flickered as they were passed through, showing they were not illusions of magic. Rumia guessed they were something Rika made with science.
Then, ahead of the group, was indeed Rika and a strange device, twice as large as her short stature, which was like a ring, glowing blue inside.
Rika looked at the approaching group, and spoke to the device.
"I've been discovered! The plan may have to move forward!" she said, before she pressed a button, and the fake trees vanished, revealing a crater.
"Well... it seems those fairies who stumbled upon my teleporter were a bigger thorn than I imagined." Rika said.
"What are you doing Rika?" Rumia said.
"Isn't that obvious? I'm helping the Lunarians come to Gensokyo so they can clear the impurities, and get their Princess back. I simply made a deal so that they leave the humans, and me, alone in exchange. Voila, youkai genocide."
"Knew it." Rumia said flatly. "You're so predictable Rika."
"Then how about you predict this one, Darkness Youkai. I made a second part of the deal. They were not to kill you either. No. That one is my pleasure. I'm almost glad you're here, so I can kill you myself now. Saves the Lunarians the trouble of catching you alive." Rika said.
"Madwoman..." Mystia hissed.
"Ice Sign: Freezer Blast!" Cirno said, unleashing a massive wave of frost that froze Rika solid.
"Well, uh, that was easy..." Rumia commented, as the ground shook and moved below Rika, before a large eye-like robot rose from it, and the ice around Rika broke.
"Evil Eye Sigma Mk II!" Rika said, as the eye looked like it was straining, before multiple explosions happened, seemingly at random, forcing the group to scatter, mixed with other danmaku and lasers.
"Wow! This thing's got insane danmaku!" Wriggle said, hardly dodgeing.
"This one's not gonna be easy!" Mystia said.
"I'll admit, this thing's danmaku is almost as good as mine!" Cirno remarked.
"I guess it's got the same danamku-resistant shields that the other machines she used had. I got an idea." Rumia said, before she noticed a path, and darted in towards Rika.
"If the machine is protected, I'll just attack you!" Rumia said, throwing a punch with all her weight behind it.
A metallic clang rang out. Rumia's hand felt like the bones inside it broke into fragments. Rika stood, smiling. Rumia was confused. It felt like Rika's body was... metal.
"I've been looking forward to this moment for 18 months." she said, raising a spanner.
A sickening pain to the back of the head. A scream, although Rumia didn't know who. Rika's laughter. Rumia fell. Everything turned to black.
Silence, and then, a voice.
'Weakling.'
Author Notes: Bah, another short one, but the next couple of chapters are really important and will likely be longer. Just the old 'This seems like a good point to end it' despite there not being too much actually there. I'd rather two shorter chapters than one huge 3000+ word one.
A bit of Cirno's new strength was shown off though, she was never strong enough to flash-freeze something the size of Rika before, especially without contact.
And yep, Rika's not gonna give up so easily. She's at it again.