Disclaimer: I don't own Naruto or Yu Yu Hakusho (where the plot is from)!

I know I just brought out a story, but this plot bunny decided to jump out at me and so I let it pan out on paper!

Hope you like it!

Crystal Tears

Tsunade looked through the list of requests and found an A-rank mission that no one had been assigned to yet, and read the description.

In need of ninja guards for protecting an important investment. Will pay anything for two months' guard duty, no strings attached.

Client: Moshimoto Keiske

Location: Mizu no Kuni

"That's odd, why haven't they asked for help from Kirigakure? Perhaps they were refused. Now who to send…" She snorted when she saw who was available. "That's quite obvious."

She called for the team, and they came swiftly.

"Tsunade-obaa-chan, what's this new mission?" Naruto asked, looking eager.

"Team Kakashi, you are to report to this man's home for guard duty."

Kakashi took the paper as his blonde student protested, "Guard duty?! What kind of boring mission is that?!"

"You may just have some action during that time, because according to this report, many ninjas have tried to steal what you need to guard."

"Shishou, what rank is this mission?" Sakura inquired.

"A-rank, because of how important it is for the client's investment to be protected, and it's for two months."

"Do we know what this 'investment' is?" Kakashi questioned.

"No, it isn't mentioned, just that it's worth billions. Now that you know your mission, you need to move out immediately!"

Naruto walked with his team, hands behind his head. "I wonder what our client will look like. Is he an old, fat guy drowning in money?"

"I hope he's handsome and well-dressed!" Sakura chimed.

"Whatever he looks like, we'll be polite and do as we've been asked to do," Kakashi stated, a little tired of how his students were, even after all this time.

"I just hope he isn't anything like Gato," Naruto sneered.

"I can agree with you there," Sakura agreed.

So they traveled for a long while, until they got to the designated location, in the heart of Mizu no Kuni. Naruto gaped at the huge manor that they came upon, jumping up and down. "It's huge!"

"Of course it's huge, Naruto," Sakura reprimanded. "This guy is one of the richest people in Mizu no Kuni, after all."

"But look at it! It took us half an hour to get from the front gate to here! This guy knows how to live well!"

Kakashi knew that Naruto would be like this until the initial shock wore off and he'd been here a while. "Let's get going, we don't need the client to wait any longer than he has."

The pair nodded, following the Jonin to the front door, which opened on their arrival. An old, tall, wrinkly man in a suit stood there. "The ninjas from Konohagakure no Sato, I presume?"

Kakashi nodded. "Yes."

"Very good, I will escort you to the master."

Now even Sakura gaped at the finery around them, pieces of art from all over the land, chandeliers in every room, plush carpet throughout, the best pieces of furniture placed exquisitely wherever they turned, a massive library in one room they passed, before they went to the second level to find that they were led into a bedroom. A young man, no older than seventeen, sat up in bed, wearing a pale blue yukata with a single ring around his left index finger from which sparkled a diamond of utmost beauty. It was clearer than any diamond any of the three had ever seen, more luminous, even in the low light. But what made them the most amazed by the kind face that the boy wore.

"The Konoha ninjas, Moshimoto-sama," the butler announced.

The young man nodded, smiling gently. "Thank you. You may leave the room while I speak with them."

Kakashi stepped forward and bowed a little. "You are Moshimoto Keiske?"

"I'm afraid that's my father. He's away on business for the first week, so I'll be your host for that time. My name is Moshimoto Takeshi. May I have your names?"

"I'm Hatake Kakashi, and these are my students, Uzamaki Naruto and Haruno Sakura."

Takeshi smiled again, although he seemed rather sickly, very pale and rather thin. His eyes were clear blue, like a pair of aquamarines, large for a young man his age. His hair was long and thick, a deep brown, pooled around him on the bed, even if it was tied at the base of his skull. "I suppose you want to begin your assignment as soon as possible, so I'll lead you to where it's held."

He rang a bell and the butler from before came in. "Yes, Moshimoto-sama?"

"I need to get up to show where the investment is held."

"Of course, young master."

The sheets were drawn back to reveal that he was barefoot yet still rather bony. The old man lifted his master up, not even grunting from holding his weight. "This way, please."

Naruto muttered to Sakura, "That kid's so thin I thought he was going to snap in two as the old guy lifted him. I wonder what's wrong with him."

"I'd have to check him out if I'm able, he could be too weak to walk, is all, or it could be a little more serious than that," the pink-haired girl whispered back.

Kakashi ignored the pair and asked, "Do you know what the investment is that we're guarding?"

Takeshi shook his head, eyes apologetic. "My father never told me, only that the diamond on my ring is a little piece of it."

"So your father is in the diamond business?"

"It appears to be that way. He never gives me the specifics, but all the gems come out of the room I'm guiding you to."

"Will we get a look inside the room?"

"I'm afraid not, there's only one key to it, and my father holds it, so all I can do is show you the door."

They went down into a basement level, the finery ending at the stone stairs. The temperature dropped several degrees, making everyone save the butler shiver. They went through several hallways until they reached a thick, steel door bolted and locked shut. Takeshi waved to the door and announced, "This is the room you're supposed to guard. Only two of you will need to guard it at once, because the ninjas only send no more than two at once to try and steal what's inside, so you can do guard duty in shifts."

Kakashi nodded. "Naruto, you and I will take the first shift. Sakura, you should get some rest after that long trip."

Sakura gave a quick nod. "Sure, Kakashi-sensei."

She walked with the butler, looking at Takeshi with concern. "How long have you felt poorly, Takashi-san?"

The butler was the one who answered. "The young master has been in poor health for nearly two weeks now. He stays in bed to save his strength."

"I'm a medical ninja; can I check you over to see what's wrong?"

Takeshi raised his eyebrows. "Ninjas need doctors, as well?"

Sakura smiled. "We're just like the rest of you! I'm actually very skilled in what I do, one of the best in my village."

"Okay, that would be good."

They got to Takeshi's room, where he was laid down and Sakura took her gloves off, pulling her hair back. She assured, "Nothing should hurt, so don't worry. I'll listen to your heart and then I'll need to check your throat. The second thing might be a bit uncomfortable, but please remain still while I do so."

She placed her head on his chest, before she gestured for him to open his mouth, sticking her thumb and pointer finger into it, the teen gagging a little until she removed her fingers. She frowned and ordered, "I'll need a pad of paper and a pen."

When they were given to her, she wrote several things down quickly. "I need these ingredients in large amounts, put in water and placed in buckets, while this second list I'll need to combine myself. Hurry!"

The butler nodded and ran out, Takeshi asking, "What's wrong with me?"

"You've been poisoned, and I need to get it out of your body. It's sapping your strength little by little, but by how I can see, it's been administered to you in doses through some sort of liquid. Someone is trying to kill you, and I'm thinking it's because they want your father's money."

"I could see why, if I'm dead, my father has no one to pass this wealth on to, and it would fall into the hands of whoever grabbed it first."

"I need you to stay calm; your speeding heartbeat will only spread the poison faster."

"O-oh, yes."

When the butler came back, he had a maid with him who held the smaller amounts of ingredients while he carried several buckets, some full while some were empty. "Thank you. Now, I need someone to hold him down while I do this procedure."

Takeshi shook his head. "I can hold still, I promise."

"It's very uncomfortable, even painful. Are you positive?"

"Yes, Haruno-san. Please, just go on."

Sakura nodded and used her chakra to pick up a large amount of liquid in a sphere shape, parting his yukata to press it onto his chest. He jumped a little as she pressed it in, but didn't move after that, even as she extracted the greenish-white substance from his body, dropping each sphere into an empty bucket as she used it. She was surprised by the amount of poison in his body. It was almost more than what Kankuro had had in his body when he'd been poisoned by Sasori. She was able to remove most of the poison, before she began measuring the other ingredients to make an antidote.

She was lucky that she had such a wide array of ingredients to work with, so she had the antidote made quickly. She helped Takeshi sit up and softly ordered, "Drink this, Takeshi-san. All of it, and you should feel much better in a few days if you rest and eat well. Now, I need to talk to my mentor."

"Thank you, Haruno-san. You…you saved my life."

"Just get better and tell me if you start feeling ill again."

"Of course."

She ran down to where Kakashi and Naruto were guarding the door, wiping her forehead as she let her hair down. The Genin noticed her tired state and asked, "You looked bushed, Sakura-chan. What were you doing up there?"

"I found out what Takeshi-san was being poisoned, so I'll have to give him daily check-ups and look around to see who might be giving it to him. There's only so much antidote before it starts running out."

"I'll find the perpetrator Sakura," Kakashi assured. "You just protect our client's son, even though we weren't assigned to do so. If it's one of the staff, it's an internal affair that we'll have to inform Moshimoto-san of, but if it's a ninja, we'll have to intervene, because someone might be trying to get rid of Takeshi-san so that the fortune is up for grabs with no heir to the estate."

"Of course, Kakashi-sensei."

Kakashi watched the elaborate kitchen on his turns to rest, nothing happening for a day or two until late one night, a shadowy figure entered the room, pulling out a syringe of what looked like the poison Sakura had described and administered it to the ice tea that Takeshi had in the morning. The unknown figure moved unlike any of the staff there, so it had to be an outside enemy, and from the subtlety of the movements, a ninja. He recognized the scent of this particular ninja, but before he could do anything, the ninja vanished.

He stepped out of his hiding place, going to the tea and smelling the poison, although it was undetectable by a normal human nose. He poured it out and replaced it with an older brew that would help strengthen his body against poisons. He then slipped away to rest, satisfied that his work was done for the night.

In the morning he reported to Sakura and Naruto.

"A ninja, Kabuto, is administering poison through Takeshi-san's ice tea that he has every morning. We have to stop him if we are to save Takeshi-san's life."

Naruto clenched his fists. "I wanna pound him now! What does he want that he's killing an innocent guy?!"

Sakura bit her lip. "It's probably because Orochimaru wants something, either the funds or what's inside this room, whatever it is. If the poisoning fails, he'll probably take more active measures to either end Takeshi-san's life or steal the 'investment'. I just hope that it's not the former."

Naruto rapped his knuckles on the steel door. "I really wanna know what's in here. I wonder if we'll actually get to see."

"I suppose through steel this thick, we would need the Byakugan to see through it, but we don't have Neji or Hinata with us," Kakashi observed. He lifted his hitae-ate and opened his Sharingan eye. His eyes widened when he saw something written in chakra on the inside of the door.

"What is it, Kakashi-sensei?" Sakura asked, seeing his shocked expression.

"There's a message written in chakra on the inside of the door."

"What does it say?" Naruto demanded, eager to find out a clue as to what was inside.

" 'Help me. Get me out of here.' "

There was a moment of stunned silence, before Naruto exploded, "A person is in there?!"

"Wait, there's another message being written."

There was another tense moment of silence. Kakashi looked increasingly worried as he read the message aloud. " 'Yes, please help me.' "

"They can hear us but we can't hear them?" Sakura wondered aloud, knocking on the door. "How can that be?"

" 'My hearing is much better than even a ninja's. This door is sound-proofed but I've learned to hear things through the vibrations that come through it. Is the man who has imprisoned me here back from his business?' "

"No, he's not due back for another four days," Sakura answered. "Are you a ninja if you can use chakra?"

" 'No, I'm not, but I use chakra regularly. I was never given the opportunity to be trained. For so long I've been locked up in here. I don't even know how long it's been since I've seen the sun. The world could've suffered through another great ninja war and I would've never known it.' "

"If you can use chakra, then why haven't you tried to escape yourself?"

" 'Unfortunately, they have chakra inhibitors on my body that I can't remove myself. It's taking all my energy to write this.' "

"How much longer until you run out?"

" 'Not much longer, because it takes a lot of stamina and chakra control to keep this going. So, will you free me?' "

Sakura looked to Kakashi, who sighed in helplessness. "Sakura, we were assigned to guard them that no one would steal them away, but locking a person up to make money, I don't know if we should leave this alone. It matters what measures Moshimoto-san is using to get the diamonds." But he gasped as he read the next line that was written.

" 'Any means necessary, and that includes all types of torture, but I've gotten to the point that it takes extreme pain to even draw out a few.' "

"What do you mean?" the pink-haired girl asked.

" 'I cry—' "

"What happened, Kakashi-sensei?"

"It seems that whoever they are has passed out. So this person cries diamonds…but how is that possible?"

Naruto growled. "What does it matter?! That person gets tortured for that bastard to sell those diamonds for tons of money! It isn't right! Sakura-chan, bust down the door!"

Kakashi held up a hand. "We'll wait until Moshimoto-san returns here. If he allows us to see this person, then we'll check for signs of recent trauma. If he doesn't, then we'll have to just sit and wait until our assignment is done."

"But Kakashi-sensei, what if Orochimaru gets his hands on this person before then? We'd have to rescue them from a Sannin, then!" Sakura protested.

"One of the things both of you must learn is patience. If something happens, we'll act. If not, then we'll complete our assignment and walk away from this place forever. If Hokage-sama decides to take action after we report what's going on here, then we might be sent back here to rescue them."

"Okay," Sakura replied, nodding.

"Got it," Naruto chimed.

And here's part one! Part two will be updated...maybe after the new year! I really want to see how people react to this fic!

Please review!