Emi watched the world in a state of indifference. She had felt this way a few times before, but couldn't place where. She didn't feel pain, she didn't feel numb. She just felt… nothing. Like she was nothing. And nowhere. She felt no happiness, no sadness. No concern, no apathy. Just nothing.

It felt like she was watching a movie, but from her point of view. The world was playing out before her, her body moving through life, without her having to give a thought about it otherwise.

It was weird, this feeling of not feeling. She felt like she knew something, something was wrong. Something was different, but her mind just felt too hazy. It felt like she wasn't there, wasn't alive, wasn't existing in time. And yet, she was still here. Should she fight for consciousness? Was that even an option?

Something had to matter to her right? There was something itching at the back of her mind but… she just couldn't grasp it. Was there anything there at all?

She was so out of it. But why? Why at a time like this?

A time like what? What is this? What's going on? Am I… Who am… no why I am here? This isn't right this…

Suddenly her head seared with a burning pain, collapsing her to her knees in her mindscape.

What the fuck?! What is-

Once again her mind drew a blank. She felt nothing. Knew nothing. Was nothing. She watched the world play out before her.

Again the cycle continued. Each time her consciousness threatened to breakthrough, her brain was singed into submission.

But each time, she got a little closer to breaking the hold. She finally noticed a seal on the wall of her mindscape. She wasn't good with seals at all. Actually, her knowledge of fuinjutsu was terribly limited to almost nothing. But if Kakashi had taught her anything, it was that a seal meant someone else was in control of it.

That's it! Someone else is in control! I have to-

Emi cried out in a painful scream as her consciousness was wiped away again into a blank slate.

Her thoughts began to pile up again and again.

Wasn't I supposed to remember something? There was something, or someone… someone.. Ka.. kaka? Baka? No who… what did they say? Frustrated she finds the faint outline of the seal. Seal…seal… Kaka.. Kakashi!

But this time was different. This time, instead of fire pillaging her brain, her body began to heat up. It was a nice warmth. It was comforting, and safe. It felt different, it felt like something. It felt good. Almost like butterflies fluttering in your stomach, or your heart letting you know it's there in your chest.

What is this? What is this feeling? I feel like I want to get away from here. I have somewhere else to go. Somewhere to go with someone. I have someone. I've never had someone before… to go to… I just want them to take me with them. I want to go.

Emi felt like she was being sucked out of her own body. But in reality, she was being sucked away from the seal designed to keep her in her mind, locked away while her blacked out mind functioned like a zombie with a master.

The first thing she noticed was that her eyes were closed. But she felt something around her. Specifically her waist. Something was holding her tight, and she felt herself give in to the grip. Next she noticed the heat, the hot air of someone else's breathing on her cheek. But it wasn't bad. In fact, it felt like it belonged there.

Lastly, she noticed that something was in her mouth. Something was dancing with her tongue, and something wet and plump was pushed against her lips. It felt good. Really good. So good that she wanted more. She reached out for the thing holding her and found it, squeezing it into her chest. She liked how it felt against her chest, and her hips begged to move closer.

The world had ceased to exist around her. She couldn't see or hear anything. All that mattered was this feeling that was overtaking her body. It felt so much better than the prison in her mind.

Suddenly the warmth, the dancing, the wetness pulled away from her. Not too quickly, but not too slowly for her to react. It all left her, and she forced her eyes open, to see what mysterious being had made her lose herself while she was… what was she doing again. Where was she?

Blinking in the light, she caught the desperate look of a gray and red eye.

"Emi?" She wondered if that was her. What was her name again?

"Emi!" The eyes looked more impatient, and scared, this time.

She didn't know where it come from. She had stopped thinking at this point. Nothing made sense. Nothing felt real. In that moment, she didn't even think before the name rolled off her lips, "Kaka...shi?"

…Before out in the real world…

Pein watched as Emi charged towards him. He didn't lose his footing when he simply said, "Shinra Tensei." The Almighty Push manipulated repulsive gravitational forces, sending Emi flying back in the opposite direction at great speeds.

(Little bit of history here, if you know it you can skip it) This "Pein" (Pain) was actually a dead man. His name was Yahiko. Yahiko was once the leader of the peace organization, the Akatsuki that started with orphaned Ame shinobi who wanted to end wars. When Hanzo felt threatened and launched a surprise attack on the organization, the main three members of the Akatski (Konan, Nagato, and Yahiko) were the targets of his attack. Capturing Konan and Yahiko, Hanzo gave Nagato the option to kill one member in order to save the other. To save him from having to decide, Yahiko took his own life. Overcome with grief, Nagato slaughtered the rest of the men using the power of the Rinnegan, although the fight did permanent damage to his body. Because of this, he became frail and immobile. To compensate he used 6 dead bodies to control using black chakra receivers. He called these bodies the Six Paths of Pain. Each path had its own particular jutsu(s) and each body was controlled by Nagato, who had to be somewhere near the fight in hiding. The Deva Path was used from Yahiko's dead body, which was Nagato's favorite to use. At this point, Nagato took control of Ame, changed his name to Pein (Pain), and became manipulated by Tobi (Obito) to lead a new version of the Akatsuki, with the ultimate goal of stealing all the tailed beasts in order to have enough power to cast a worldwide genjutsu on everyone. (And that's the extremely shortened version)

While Nagato agreed to find peace, he was always reserved, looking for another way. He personally believed that others had to experience the pain he had experienced in life in order to end the cycle of revenge and hate and ultimately bring about peace. They could only learn if they knew pain. However, his philosophy had one tragic fall, as the pain he caused others only increased the cycle of hatred and would never bring about true change.

Back to the fight!

"Zombie Emi" quickly used her air bending to manipulate herself in the air, bending herself straight so her legs were beneath her. She channeled nature and wind energy to her feet, fighting against the push. She slowed herself considerably, enough to safely land to the ground with some earthbending.

Her face was devoid of emotion. Bending the earth to her body, rocks clung to her legs. This time she pushed her legs off with earthbending, then formed little rockets in her hands with her firebending. With the speed of the combined attacks, she blazed forward, streaking the sky with fire.

Nagato (Pein/Yahiko) was counting in his head the seconds. The one drawback to his attack was the five second delay before he could use his attack again. The blonde was approaching fast, too fast.

Pein moved quickly, dodging the attack. When he turned around, the blonde had already turned in midair, bending the rocks from her legs to her arms to reinforce her punch. At the moment five seconds were up, and he pushed back with Shinra Tensei again.

Emi's body was flown back, the rocks peeling off her body as she was thrown back in a disorienting position right before she could land her would-be devasting punch. Before she could bend air to slow herself down, her back hit a nearby rock, sending blood flying out her mouth.

…

In the meantime, Kakashi refused to sit on the sidelines. He watched in horror as Emi's body forced itself to the max, fighting the godlike Pein. He turned his sights to Inoka, the man behind Emi's lost childhood and innocence, and the one controlling her now.

'Every jutsu has a weakness,' he thought to himself. 'How can I loosen the hold on Emi? Through Emi or Inoka?'

Unable to reach Emi at this point, he set his sights on Inoka. He threw three kunai at him, two to distract him, while the other contained an explosive tag. Inoka realized at the last minute, and jumped to safety while smoke covered the area.

Exploding from the smoke, Kakashi gave him no time to land, swiping at his feet causing the man to fall to the ground. Kunai in hand, he went to slice at his chest, but Inoka caught his fall with his hands. He turned himself just in time to only get sliced through the shoulder, his blood wiping across Kakashi's kunai. Inoka kept his momentum going by spinning his legs like a windmill, causing Kakashi to jump out of the way.

The two stared each other down. Inoka raised his hands in a rectangle. Recognizing the technique from before, Kakashi used an earth jutsu to raise a wall to hide behind from the attack. He then threw smoke bombs to create a screen, and tracked the man with his nose.

He came in from above, kunai in hand to land at the base of Inoka's neck. But Inoka sensed his presence, turning at the last minute to catch Kakashi's hand midair. Kakashi countered landing his other hand on Inoka's shoulder, while grabbing the wrist that caught his hand.

He used his body weight to swing around to Inoka's back, forcing the man's arm over his shoulder. Kakashi pulled and flipped him on his back. Inoka hit the ground hard, but not too hard to be deterred from his original purpose.

While Kakashi prepared a lighting blade, he was too slow to see Inoka's hands return to a rectangle. Just as he was to land his hit on Inoka's chest, Kakashi's mind went into a frenzy.

"Gotcha," Inoka smirked.

Suddenly, Kakashi's body turned to smoke and disappeared with a 'poof.'

"Shadow Clone," Inoka muttered, his smirk quickly fading.

The earth began rumbling underneath him, and before he could move, canines of different sizes burst from the ground and bit both his ankles. Two other dogs jumped out to bite his wrists, pinning him to the ground.

"Kuchiyose: Doton: Tsuiga no Jutsu (Summoning: Earth Release: Fanged Pursuit Jutsu)" Kakashi says from behind him. He smirks under his mask, holding the bloody kunai in one hand and a scroll in the other, "Stay right there. I don't know if it's you or Emi I need to stop your jutsu, so you're going to stay put."

"If he moves, tear him shreds," he adds to his ninken.

"What an empty threat," Inoka laughs. "You're not going to kill me if it kills your precious Emi as well."

Kakashi stared back at him with eyes devoid of compassion or empathy. It's the stare that brought many enemies to their knees and begging for their lives. "If you think that I wouldn't hesitate to kill you after all you've done, you're wrong. Even if it does kill Emi, she would be happier that your existence is wiped from this earth than to live like a slave."

He turned a cold shoulder and walked away to Emi's fight.

…

Emi licked the blood that trickled off her lips. She gathered rocks in the air now, sharpening them to spears of earth. Now if her attack was repelled, she herself could go for the main body.

Rushing forward again, she used her airbending to jump higher than any normal human could, and sent her earth spears flying at Pein. He repelled them as she thought, and this time in the sky, she weaved her arms quickly in circles, gathering the electricity in the air.

She shot blue lightning down towards his body. At the speed of light, it reached him before the five second gap. The lightening ripped through the dead body, but that didn't affect him much. It did however, momentarily disrupt his chakra sensors enough for Emi to fall from the sky with her leg outstretched, much like Gai's Leaf Hurricane, powered with high speed and destruction with her airbending.

The blow landed on Pein's head, smashing him into the ground like a wack-a-mole, and creating a huge crater below him.

Emi backflipped off of his head, landing with her back to him. In that moment, before she had the chance to move, an arm caught her around her waist. It pulled her in close and quickly, so fast that she could not register friend or foe. So fast, she could not resist when lips pressed against hers. So fast, she could not deny his tongue entrance into her mouth.

'I hope this works. Please, please work," Kakashi thought to himself as his kissed the zombie Emi. Emi's eyes closed and she stopped resisting.

Kakashi felt himself being pulled into the embrace, and let himself close his eyes for a moment, lost in the kiss. Then he remembered why he was there in the first place. He pulled back unwillingly from the kiss.

"Emi?" he asked desperately.

Her eyes slowly creaked open, dazed and somewhere else. "Emi!" he cried, shaking her slightly to get her to wake up.

She stared at him for longest five seconds of his life, before her lips began to move. "Kaka…shi?" Her voice rasped out.

He hugged her, almost crushing her bones. He planted his face into her shoulder and muffled, "Emi," into it. "Emi, you're back."

"Back?" she asked confused. She looked around at the destruction she didn't remember being there before. "What…?"

Kakashi narrowed his eyes and shook her a little harder this time. "Come on, wake up." She kept her confused face and furrowed brows. He shook her harder, "Wake UP!"

Something in his voice made her snap back. Suddenly, her consciousness seemed to find her again and she blinked all doubt away, "What? What happened?"

"Inoka took control of your mind. You've been fighting Pein against your will."

"So how did I?"

"Well, you see I.. well um-"

Splurch. Emi's eyes widened and she fell like dead weight into Kakashi's arms.

"Emi!"

"It's al-" Emi began coughing and blood pooled in her mouth. She crooked her neck backwards to see one of Pein's chakra receivers imbedded in her back. "Ha. Haha. Ha." She awkwardly laughed. "Well, fuck."

Kakashi's eyes widened in fear, "No."

Emi's eyes were soft and sweet, "It's alright Kakashi, I'm-"

Emi's eyes grew serious and narrowed. She felt the chakra receiver in her back, and in her sage mode, her own chakra started to follow the track. She reversed sensed Nagato, hidden away in a tower of Ame, frail and connected to many more chakra receivers.

"Found you," she coughed as blood spilled out of her mouth. "That's not him, Kakashi." She stood up, pushing off Kakashi.

"Emi, wait you're-"

"Kakashi, take that out of my back." He nodded and pulled the receiver out of her back, causing blood to spill out of the hole and dropping Emi to one knee.

"Fuck," Kakashi whispered.

Pein had managed to get up to his waist out the hole when he sent a rod flying at Emi. She limped back towards him now, but instead of fighting she declared, "I don't know who you are. The me you were fighting was being controlled. I have no quarrel with you."

"You are a citizen of Ame. That means you belong to me." Pein replied.

"I belong to no one."

"Then it seems we do have a problem."

"I didn't come here to kill you. I only came here to kill one person."

"So the cycle of hatred continues." Pein starts.

"The what?"

"The cycle of hatred. Unless you experience the same pain as someone, you cannot truly know another. But even then, there will be no understanding. A cycle of hatred begins, as it has all of history. Therefore, I have concluded that humans are incapable of understanding one another. The world of the shinobi is ruled by hatred. By killing another, you start a new cycle of hatred. You kill someone else's family, friend, village. Then they will hate you, and seek to kill you. Killing you will spark hate in your family, friends, and village. And the cycle of hatred continues."

Emi takes a long breath in and out, "Ok. And so what is your solution?"

"I shall bring about peace, I will bring justice."

"By doing what?"

"By making the world experience my pain until they are desperate enough to fall into understanding. I will keep searching until someone finds the answer."

"So you don't know." Emi looks away and across the battlefield, to a man struggling against Kakashi's ninken. "I don't have time for you Pein. I'm running out of time as it is." She looked down at her shaking hands.

"Please, if you let me, let me finish my own cycle of hatred, so no one else has to die. This whole battle was pointless. All these lives were lost just for one man. And once I kill him, the cycle will end for my village, Konoha." A tear escapes from her eye as she says 'my village.' "I really like it there. They've been… so good to me. And I'm afraid that if I leave, what you say will come true."

"Oh?"

"The bonds that I've formed there… well I'd like to think that someone would be upset if I fell into Ame's hands. They would hate you for taking me. But if I do this, if I kill the man who has hurt so so many people, I will end the cycle of hatred for many. And while some may come to hate me, let them. After this, I am sure to die. I will take their hatred with me to my grave. So please, please Pein. Let me do this,"

Pein thought about her words. They were not the answer he was looking for. But this girl intrigued him. She seemed to know pain like him. He believed in her logic, and wished to see if her proclamation would become true. He nodded, and let the girl limp toward Inoka.

She faced the man that had tortured her for half of her life. Kakashi and Pein kept a good distance away, but close enough to hear on the silent battle field.

"I told you I was going to kill you. I'm not killing you in revenge. I'm not killing you because of what you did to me, or the ones I love. I'm killing you because I have a choice. Never before did you give me a choice not to kill. But here I am, with choice to kill you or not. I know it is not my place to take a life. I cannot play kami (god). But I know how many lives you have ruined, and how many people have lost their will to live because of you. You will never reform, and I don't have the time to see that day even if it could come. So in my last act, I will take you with me. This way, I won't ever have to use this technique that is not human ever again. It makes me a monster, and you are my creator. For that, we shall die together."

She brought her hands up in front of her. Her fingers became rigid and unnaturally spread. To the ninken she commanded, "Go. Quickly." They all let go and poofed out of existence. Not a moment later, Inoka's body became stiff and unnaturally bent. In a fluid motion, Emi yelled out and pulled her arms apart to either sides. Her face was scrunched in pain like she was moving weights in front of her.

At the same time, blood started beading out of all the pores in Inoka's body. He was frozen against his will, and his eyes were terrified. He knew what this was. A technique he had her practice and perfect over and over and over again. Bloodbending.

"The human body is made up of 60% of water." Emi mimicked the words her torturer used to teach her the technique.

In the blink of an eye, Inoka's body was splattered across the battlefield. His blood sprayed in all directions, covering Emi from head to toe to with the man's flesh, organs, and blood. His body was literally ripped apart from the inside, so no limbs or features were left to be recognizable.

In an instant, he was gone. Seconds later, the glow faded from Emi's eyes. She fell over and Kakashi ran to catch her. Right before her head hit the ground, he caught her with one arm.

He checked for a pulse. Nothing.

He checked her breathing. Nothing.

"No…" he said so softly. "No." he said defiantly. "NOO!" he screamed to the heavens. He wiped the blood and sweat off of her face, and gave her two rescue breaths. He began pumping her chest with his palms. "No! Emi! Come on, wake up!" A tear began to run down his face.

Pein watched as Kakashi fruitlessly pumped Emi's chest up and down. "I want to know her choice," he said aloud to Kakashi while simultaneously saying it to the woman who rarely left his side in his tower, Konan.

…

In his tower, Konan pleaded, "Nagato, don't do what I think you're doing. Even if you are an Uzumaki with higher reserves, do you honestly think you'll live after this?"

"Konan. I have enough chakra. I need to know her choice."

"But Nagato-"

"Stay out of this Konan!"

Nagato raised his hands in the ram seal followed by a snake seal. A bead of sweat dropped from his head as he said, "Gedō — Rinne Tensei no Jutsu (Outer Path — Saṃsāra of Heavenly Life Technique)"

…

Back on the battlefield, Pein walked over to Kakashi and said simply, "Stop this."

"I can't! She'll die!"

"She's already dead. Now move aside."

Knowing he couldn't win a battle against Pein at the moment, he remembered what Emi had said to him before she went to kill Inoka. "That's not him, Kakashi."

'So that's not the real Pein? Then where is he?' Kakashi thought. Even though he knew this was not the real Pein, he stopped and cradled Emi against his chest. "Why?"

"You shall see the power of Pein." The orange haired man stepped back and his body seemed to freeze.

Suddenly, the king of hell rose from the ground. From his mouth a green light flew out and into the body of Emi.

Breathe returned to her lungs, and her heart began to beat once more. "Mmmm," she mumbled as her eyes twitched and began to flutter open. The hole in her back was healed, as well as the other injuries she had sustained.

"Emi…" Kakashi's voice cracked.

"Hey," she responded. She looked around at her surroundings and then down at herself. Lastly, she looked at Kakashi's tired face starring back at her and said, "Looks like I'm not dead."

Kakashi wanted to laugh but instead replied, "You were."

She smiled sweetly and reached up to touch his face. She grabbed his headband and pulled it over his Sharingan eye. "It's ok," she said.

The two stared into each other's eyes for a moment as the adrenaline from Kakashi's body slowly slipped away. "I-" he tried to say before his eyes rolled to the back of his head, which slumped forward onto Emi's chest. A light pink etched across her cheeks.

"You better be passed out I swear…" she muttered to herself. She took off his Jounin vest and slid it under his head, at least giving him a pillow for the ground.

Just as she laid him to the ground, a tornado of white origami papers came swirling towards her. She felt chakra in the paper, and stood up to guard Kakashi.

The papers formed into a woman with blue hair and pretty eyes. "I'm not here to hurt you," she started. "I am Konan, a friend of Pein's. I came here to collect his body. He is exhausted from reviving you and cannot use anymore chakra."

"Reviving me?"

"Yes, he revived you and wants to meet you."

"I guess I owe him as much." She looked towards the unconscious Kakashi. "But I can't just leave him here."

"He requested you alone."

Emi nodded at Konan and bended a small earth tent to cover Kakashi. Then she formed her index fingers in a cross and took a deep breath while hoping for the best. "Kage Bushin no Jutsu."

With a smoke and a pop, a perfect solid clone of Emi came into existence next to her. "I guess all that training with that maniac paid off for something," she muttered, "Ok, I'll go with you."

Konan nodded and led Emi towards Nagato.

…

Although Nagato dies from the resurrection technique in the manga/anime, that was bringing back almost a whole village of people after having completely lost to Naruto with his Six Paths of Pain. He was totally exhausted, so some say he died of chakra exhaustion, not the technique.
I'd like to think that even if the technique would kill the user, being an Uzumaki with a greater life force and amount of chakra, Nagato could survive bringing back one soul from the dead.