So, I've been watching a bit of Dragon Ball, a bit of One Piece. Played a bit of Tekken, a bit of Final Fantasy VII. So I did this. Vote in the poll on my profile if you want this to continue.

Disclaimer: I don't own Assassination Classroom. Assassination Classroom is owned by Yusei Matsui and Shueiesha.

The story of Pandora's box. It tells of a beautiful, but curious woman named Pandora. She was given a box by Zeus, king of the gods. He told her to never, under any circumstance, open the box. But Pandora was endlessly curious, and though she was told not to open the box, her curiosity took over her. When she was, she opened the box, unleashing the seven sins into the world, dooming the world to become corrupted. At least, that was the story that was told.

-Line Break-

"..." a guard looked up and down the hall, before he leaned his head back and yawned. His yawning was immediately cut off as he was grabbed from behind and yanked into another hall. Karasuma grunted as the thug thrashed before falling unconscious from his chokehold.

"Good. The poison seems to have worn off somewhat. I should be at about half strength now." Karasuma said as he cracked his fingers as he peered around the corner of the hall. The fifteen students with him sweatdropped at this.

"Which means you're more than twice as cool as a regular man." Kimura said.

"Why didn't we let him go by himself?" Kataoka asked as the group began to move. Korosensei, in his Absolute Defense Form, spoke up, revealing that the perpetrator was unlikely to be an assassin. Karasuma began talking about a new plan, but Nagisa didn't notice as he looked at Terasaka, who was panting heavily. He reached out and felt his neck, surprising the former bully.

"What the-?"

"Terasaka, you're burning up! Don't tell me, were you-" Nagisa cut off by Terasaka putting a hand over his mouth.

"I'm fine. I'll just walk it off!" Terasaka grunted. Nagisa pushed his hand away.

"The poison is fatal!" he protested.

"If it wasn't for me, Karasuma wouldn't have gotten himself gassed. And don't forget I almost had you guys killed. I ain't going to drag you guys down anymore!" Terasaka groaned as he turned away. Nagisa looked after Terasaka in worry, but blinked when he felt something burning in his stomach, making him wince.

'My stomach is burning, and my head is aching. Why? Am I sick too?' He put a hand over his stomach before looking at the door the team was about to go through. Karma and Kayano looked over and saw him.

"What's up Nagisa?" Karma asked, causing the group to look at him.

'Terasaka is sick. He needs to rest.' Nagisa opened his mouth, but spotted Terasaka shaking his head, his eyes pleading with Nagisa. Nagisa frowned, but sighed in resignation.

"I have a strange feeling about that room. There's something very dangerous inside there. We should be extra careful." Nagisa said. Karasuma nodded in acknowledgement.

"Nagisa's right. We're up to the final boss, but this just means we have to be even more cautious. Be prepared for anything." the agent warned, receiving a chorus of 'Yes sir!'s before stepping forward, holding a gun he took from Chiba. The group quietly stepped in, Nagisa wincing slightly as the burning seemed to slowly increase.

Karasuma peered over the corner, spotting a man sitting in a chair in front of some computers. He raised a hand and motioned for the class to move forward. They carefully shifting their weights as they walked. Nagisa felt the burning increase more, but ignored to move up to the man. The man has a hand near a remote, and there was a small bag nearby as well. He noticed a metal case nearby, with explosives taped on.

'That must be where the antidotes are.' Nagisa realized. He thought about the other classmates at the beach, sick from being poisoned. He thought about Terasaka, fighting to save their classmates. The burning increased. Karasuma readied his pistol. Terasaka raised his stun gun. Nagisa prepared to slam Korosensei into him. The rest of the students were preparing to attack with their fists.

"Itchy." the man said. The students froze, eyes widening at the sudden voice, which sounded familiar.

"Thinking about it makes me itchy. But I wonder if that's why. Since my scratches are always exposed to the air, my senses became sharp." the man said. He suddenly threw a large amount of remotes through the air. The class gaped in surprise at how many.

"I told you, I came here to kill a Mach 20 monster. I was prepared for a remote to get stolen. Even if I'm beat, I can still press one." the man said as he turned. The burning in Nagisa's stomach increased, and a pressure began building up in his head. He could barely hear Karasuma as he began speaking to the madman.

"Dammit Takaoka! What are you thinking?!" Karasuma yelled as he prepared to shoot the madman. Takaoka held up the remote in warning.

"What naughty children. I was quite surprised to see you come here in such numbers. But I guess I'll have to re-educate you." Takaoka sneered. He turned to grab the small bag, clipping it to his belt and began walking away. "Follow me. It's time for class."

'Takaoka!' the name rang out in Nagisa's head. He and the other students followed, all seething quietly.

-Line Break-

"Did you lose your head Takaoka? Hiring hitmen with stolen money, threatening students with a virus?!" Karasuma growled. They were on the roof of the building, a heliport behind Takaoka as he faced the class.

"Hey now, I assure you, I'm perfectly sane. If you had let those two bring me the target like I asked, my assassination plan would've gone smoothly." Takaoka said as he raised a hand and pointed it at Nagisa and Kayano, surprising the two.

"In my plan, that girl, Kayano or whatever. I was going to tie her up and leave her in my bathtub filled with anti-sensei material. That little bounty there would go in with here, and the two would be buried alive in cement. If he doesn't want to touch the anti-sensei material, he would have to set off an explosion, but that would kill her. He wouldn't do something so horrible, right?" Takaoka said, laughing gleefully.

'Bastard!' Nagisa thought angrily, but kept his expression calm. The pressure and heat was rising.

"Do you think you'll get away with this?" Korosensei demanded.

"...this is perfectly humane." Takaoka growled. "Compared to what you kids did. Compared to that inhumane treatment. The humiliating gazes, that little sneak attack… You left me so itchy, I can't help but scratch myself!" he yelled as he began clawing at his scars.

"I can't even sleep at night! I hope you're happy kids, because YOU KIDS HAVE CONDEMNED YOUR YOUR DADDY TO HELL!" He roared, making the students back away. Takaoka took a breath, before pointing a finger towards Nagisa.

"Especially you! Nagisa Shiota." he growled. "I'll never forgive you for tainting my future!" Nagisa gulped, fear beginning to fill him as the burning and pressure increased all the more. Nagisa could barely blink from the pain.

"He's been aiming for Nagisa ever since the start!" Chiba realized.

'When he asked for the shortest students!' Nagisa thought.

"This grudge is totally uncalled for!" Yoshida snarled.

"Heh. So you called Nagisa to get over your grudge." Karma said as he strolled over in front of Nagisa. "Would you really be happy from going all out on this little guy? I might be able to provide a little more entertainment though."

"You're crazy! You lost to Nagisa with the rules you set up yourself!" Terasaka yelled. "And besides, whether or not you won or lost back then, we still would've hated your guts!"

"I DON'T REMEMBER ASKING FOR YOUR OPINION BRATS!" Takaoka screamed, stomping forward. He raised the remote. "DON'T FORGET I CAN SEND HALF OF YOU TO HELL WITH A PUSH OF A FINGER!" the kids flinched as they stepped back. Takaoka pointed at Nagisa again.

"Now, Nagisa. You come with me. To the heliport." Takaoka said as he turned away and started up the staircase. Nagisa frowned before starting up. Kayano quickly reached out and grabbed his sleeve.

"Nagisa, you can't go!" Kayano said desperately.

"I don't want to, but I have to." Nagisa said. He gave Korosensei to Kayano. "Maybe I can calm him down. I'll just go along with what he wants, and he'll hand over the antidote. Hopefully."

"HURRY UP, DAMN IT!" Takaoka screamed from the heliport.

"Hopefully." Nagisa mumbled as he began making his way up. He winced as the burning inside him increased and the pain in his head increased, but he ignored it. He raised a brow at the sight of a pair of knives, laying on the ground. Takaoka grabbed the stairs and threw them off the heliport, letting it fall on the ground with a loud *CLANG*.

"You know what I want, right? It's a rematch." Takaoka said gleefully as he walked over to the other knife.

"Please, wait. I didn't come here to fight!" Nagisa said.

"I know. The same sneak attack won't work on me twice. I know I'll be killing you in an instant." Takaoka said arrogantly. He shrugged.

"But if that happened, I wouldn't feel any better. That's why, before we fight, I'm going to need you to do something for me." Takaoka said. He held up a finger and pointed down to the heliport.

"Kneel. Prostrate yourself. Admit you used a cowardly tactic to defeat me and cover up for your lack of skill." Takaoka demanded. Nagisa blinked, but knelt.

'It still burns, and my head is killing me.' he thought.

"...I-" Nagisa was cut off by a stomp.

"YOU CALL THAT PROSTRATING?! I WANT TO SEE YOUR HEAD TOUCH THE GROUND LIKE A BOOT!" Takaoka roared. Nagisa blinked before slowly lowering his head. His forehead pressed against the ground.

"I'm sorry. I used a cowardly tactic to defeat you. I did it to make up for my lack of skill." Nagisa said. His classmates looked at this in amazement and anger. Takaoka laughed.

"And what about what happened after that? Didn't you say something like, 'leave'?" Takaoka sneered as he walked over to Nagisa. He lifted a foot and slammed it down on Nagisa's head. "The audacity! After everything I did for you?!"

"I spoke in such a disrespectful way. I was so ungrateful. For someone like me, after everything you did for us. I'm sorry." Nagisa said calmly. His classmates fumed as Takaoka smiled.

"Alright. I believe you. Daddy's happy." Takaoka cackled. He turned away. "As a reward, I'll tell you something. The effects of the virus, it's pretty funny. Their faces swell up like a bunch of grapes from all the tumors. I bet you'll want to see it." he grabbed the handle of the case and threw it up into the air. Nagisa's eyes widened and he scrambled to his feet, lunging for the case, a guttural scream ripping from his throat.

"PLEASE! NO!" Karasuma screamed. Takaoka laughed maniacally as he pressed the button on the detonator. The case blew up, sending glass and metal all over the place. The class was silent, staring in horror. Takaoka began laughing, taunting Nagisa, reaching down to grab the knife in front of him. He didn't hear. Something was building up in him. His ears were ringing, blood was pumping. The burning was increasing immeasurably. The pain in his head was unbearable. Then suddenly, the noise, the burning, the pressure, stopped. Nagisa stared down at the knife in front of him. He reached out, putting his hand on top of it, gripping it and lifting it up.

"Oh, are you going to do it?" a voice said.

'Kill him? Yes. I will.' Nagisa thought.

"Well then. I believe I can help you with that." the voice said. The bag on Takaoka's belt suddenly jumped. Takaoka looked down at it.

"Oh yes, before we start having our fun, I wanted to introduce you to something. A little toy that I found with some of the money I took." Takaoka said smugly. He reached into it and pulled out a small, black orb. The orb seemed to pulsate as shadows dripped off the orb.

"This is the Kandora. A little toy that is quite fit for me." Takoka said. "Supposedly it holds the spirit of rage, unleashed from Pandora's Box. Have you heard of that legend? Naturally, since I'm the most angered here, and the most victimized, all that power is mine."

"Don't you dare act like the victim!" Karasuma screamed as he pointed the pistol towards Takaoka. The man quickly whipped out three vials, holding them up.

"Don't even try! These are the only antidotes left, and their vials are quite fragile. If you shoot me, they'll shatter! Sure, you won't have enough, but some is better than none!" Takaoka cackled. He turned back to Nagisa, who was still bent over, holding the knife.

"Well then, all I need to do is smash this little orb, and I'll be a god. Today is a good day. I get to become a god, and kill you!" Takaoka roared with laughter, throwing the Kandora onto the ground. It bounced off, before rolling and coming to a stop. Takaoka frowned.

"The hell? It should be broken!" he grunted as he raised a foot and slammed it down on top of the Kandora. Nothing happened.

"WHY! WON'T! IT! BREAK!" He screamed as he brought his foot down on the Kandora, over and over again. A small laugh made him stop. He looked up at Nagisa, who's shoulders were shaking.

"Heh. heh heh. Ha, ha ha ha!" Nagisa chuckled.

"Nagisa?" Kayano asked in concern.

"AHAHAHAHAHAHA! HAHAHAHA! RAHAHAHA!" Nagisa threw his head back and roared with laughter, his eyes wide, and seeming to be glowing. Takaoka stomped on the Kandora one more time.

"SHUT THE HELL UP! WHAT'S SO DAMN FUNNY?!" He screamed. Nagisa howled with laughter even more before suddenly stopping.

"You think you're angry?" he asked quietly, holding up a hand. The Kandora jerked, then flew out from under Takaoka's foot, making him fall onto his back. Takaoka scrambled to his feet to see Nagisa holding the Kandora in his hand. Nagisa stared at him.

"The Kandora. I'm guessing it can only be broken by the person who feels the most rage around it. It makes sense. After all, the only one who deserves that title, is me." he said. He pressed his fingers down onto the Kandora lightly. The Kandora gleamed, and shattered. The shards hung in the air around Nagisa, before swirling around him. The darkness inside spiraled around him, covering him in a vortex that became fire. The students yelped as they were pushed back, most of them falling onto their backs from the intense winds. Takaoka yelled as he was sent flying, slamming down onto his back before landing on his stomach. He clawed at the heliport, trying to grab on as he stared at the vortex in terror.

"Now. Know what it really means to suffer. To feel anger." Nagisa said, his voice overlapping with another, more sinister one. The vortex died down, becoming a black circle around Nagisa's feet. It filled out, leaving a circle of shadows at his feet, before the darkness began to crawl up his legs, going up to cover his face and hair. The students, teachers, and madman watched as the shadows stayed on Nagisa before disappearing. Revealing him with closed eyes.

"Ah. Today is a good day. I get to become a god, and kill you." Nagisa said before opening his eyes. Takaoka's own eyes widened. The pupils had stretched, reaching to the top and bottom edges of his eyes. The blue were now a glowing red, and the whites were covered in black veins. Nagisa's hands rippled before turning into scaly claws. Nagisa's eyes narrowed into a glare, and he began walking forward.

"D-don't come closer!" Takaoka yelled as he held up the vials. "I'll break them! I really will!" Nagisa stopped.

"Well. We can't have that." Nagisa said. Takaoka's eyes widened. Nagisa was no longer in front of him, but behind. He whirled around, seeing the vials in Nagisa's hand.

'I couldn't even see him!' Korosensei thought in shock and awe. Nagisa disappeared again, reappearing next to Kimura, who recoiled at the sight of him.

"You're the fastest. Go take these down." he instructed. Dumbfounded, Kimura nodded as he took the vials and began running towards the door. Nagisa turned and reappeared next to Takaoka, who recoiled and staggered back.

"Time for detention." Nagisa shot forward, grabbing Takaoka by the throat and lifting him. Takaoka choked and swung his knife towards Nagisa's face. The knife shattered on impact.

"Hm? Did you do something?" Nagisa asked, before throwing Takaoka across the ground. Takaoka got up, coughing as he held his throat gently. He got to his feet shakingly.

"You, you… you BRAT!" he yelled as he ran forward and threw a punch as hard as he could. Nagisa let the punch hit him, his flesh not even moving from the fist.

"I'm still more grownup than you." he said before slapping Takaoka, sending the man flying and spinning. Takaoka landed with a grunt before yelling as he was dragged towards Nagisa by his foot. Nagisa tossed him up and spiked him towards the edge of the building. Takaoka coughed up blood as he laid on the ground.

Nagisa spun the knife in his hand with his fingers before holding it up. Takaoka's eyes widened as a feeling of terror filled him, before he threw himself to the side. Nagisa swung the knife down, creating a giant blade of fire that slashed through the building. Everything stopped, before a large chunk of the building slid off, falling to the mountain below. Takaoka tried to leap off the heliport, but Nagisa appeared before him and kicked him high into the air, letting Takaoka fall onto his back with a crack.

"Had enough? Because I haven't." Nagisa said as he strolled up to Takaoka. He tried to get up, but was grabbed by the throat again, and lifted up. He choked, trying to break free of Nagisa's grip.

"Let me continue testing my abilities." Nagisa said as he lifted up the knife in his hand. Something clattered on the ground behind him, causing him to look over his shoulder. A stun gun laid on the ground. He looked up to see a panting Terasaka.

"HEY! DON'T LET HIM GET TO YOU! YOU'RE BETTER THAN HIM!" Terasaka yelled as he fell to a knee. Yoshida and Isogai ran up to him, but he ignored them. "YOU CAN'T LET HIM WIN!"

"He's right Nagisa! There is no point in you killing him. We can ask the poison user downstairs! You're the better man, control yourself!" Korosensei warned. Nagisa stared at them, indifferent.

"Why should I? He's so willing to kill, he should be willing to be killed." Nagisa said.

"Nagisa..." two more voices rang out. Nagisa looked at them, only to blink. Karma and Kayano were looking at him. There was fear in their eyes. Eyes that held mischief, kindness. The eyes of his friends, the ones who made him happy. Now held fear. Towards him. Nagisa gasped, bending over as he released Takaoka, who gasped for breath as he collapsed. Nagisa fell to his knees, gripping his head with a guttural scream to the sky.

"Well, that was fun. I suppose I'll be leaving now." the voice from before said before disappearing. Shadows melted off of Nagisa, turning his hands and eyes back to normal. Nagisa panted as he plopped onto the ground. Takaoka struggled to his feet.

"You… you…" he growled. Nagisa quickly grabbed the stun gun and swung it towards Takaoka's head, sending him to the ground with a vicious *CRACK* and a burst of electricity. Nagisa scooted away from Takaoka, before falling onto his back, passing out. The students quickly ran to the staircase, pushing it back up into place before scaling it and running to Nagisa. Karma and Kayano hung back, Korosensei still in Kayano's arms.

"Wha-what happened?" Kayano asked nervously.

"I don't know. But, we, almost lost Nagisa." Korosensei said.'

"..." Karma was silent, gazing at Nagisa's fallen form.

'...what the hell is he?'

And there we are! First chapter of Pandora is complete! Let me know what you all think. This is the fourth one-shot I've released that has the option of becoming a full on story. One or two more, and they will all be done. Also, I don't think I've written a chapter-long upload in a long time, I have no idea how I was able to write this so fast. I'm sorry to all those who have to wait for ages for me to update one of my fics, my word, I am terrible. As per the usual, leave a review! Azure out!