The Assassin with a Heart of Gold

A/N: This fic was written assuming a canon where Class 3-E ends up killing Koro-sensei at the end of the school year. Regardless of what ends up happening in the manga canon, this fic is assuming that Koro-sensei dies by their hands.

Pairings: Akabane Karma/Shiota Nagisa, Maehara Hiroto/Isogai Yuuma, Karasuma Tadaomi/Irina Jelavic, Chiba Ryunosuke/Hayami Rinka, Hara Sumire/Yoshida Taisei

Chapter One - The Target

Shiota Nagisa decided he was going to miss Vancouver. The weather wasn't bad, his apartment was small but livable, and the people were friendly. This city was definitely in his top five.

He couldn't stay. He knew that much. His work in this city was done and it was time for him to move on. It would do him no good to get attached to a city he may never see again outside of an airport.

Nagisa savored the smell of fresh coffee and the sound of light chatter in his favorite café. They had some great drinks and even better Danishes. If he was lucky, maybe his next location would have a good café right next to his apartment as well. He snorted. As if. His boss would probably tell him that he had softened up staying here and that it was about damn time he returned to a third world country.

"Sir, your coffee," a waitress said as she placed the cup in front of him.

"Thank you, Jennifer," he said gratefully. The girl smiled and tucked the serving tray under her arm.

"Anything else?"

"This will be it for now. I do have a guest arriving soon, if you could just direct him here if he can't find me." As unlikely as that situation would be. His boss probably already knew exactly where he was. He wasn't the type to take direction. He would find his way here when he wanted to.

"Certainly," she said as she walked away. Nagisa sipped on the cup, enjoying the drink's heat and bitterness. It was hard to believe that he had been in this city for only three months. Nagisa pulled out a tablet from his bag, unlocking it with a code and his thumbprint. He let himself smile as he saw the top headline.

CEO and Founder of The International Children's Institute found dead in home

Nagisa didn't even bother opening the article. After a while, they all read the same. A loving father, philanthropist, suspected suicide, blah blah blah. The real interesting details about his personal life and his foundation wouldn't come out for another couple of weeks. The human trafficking investigation, if properly done, was sure to shut down the non-profit for good.

"Mr. Matsunaga?" a familiar voice said. Nagisa looked up and smiled. He gestured towards the empty chair across from him.

"Lovro, it's nice to see you again. How've you been?" He didn't even blink.

"I have your next job here." Straight to the point, as always. He was so predictable. Never any time for pleasantries and small talk. Nagisa set down his coffee cup.

"Where will I be heading next?"

"Tokyo." Nagisa's eyebrows shot up. Tokyo? It had been a long time since he had been back to his home country. It wasn't long after his high school graduation that Lovro took him into his "care" (if you could call it that).

"Tokyo?" he questioned.

"You were specifically requested. I vetted it and it's legitimate. It's got a fat paycheck." Lovro slipped him the manila folder. Nagisa flipped it open and his jaw dropped.

"What is this? Who put in this request?"

"I don't disclose that, Nagisa."

"You also don't give orders to people who have a connection with the target," he said coldly.

"I would not have given you this order if I didn't think you could do it. My reputation is on the line just as much as yours." He gritted his teeth. This was ridiculous. "Can you do it, Nagisa?" He dutifully ignored the picture on the front and instead focused on the crimes. Hundreds of claims of corruption, abuse, and fund laundering. This man had his hand in hundreds upon hundreds of illegal operations.

"I can do it," he said firmly, his voice hard.

"Very well. I will see you next when you complete the job. The money from your last job has already been wired to your account." Lovro turned and left, leaving Nagisa there with a rapidly cooling cup of coffee and a million thoughts running through his head.

Nagisa spent the next three hours thoroughly reading through the thick file that Lovro had given him. His target was high up in the Japanese government, despite his young age. It told him of back-end deals, convenient deaths, blackmail and sabotage. It seemed as though his target had hired his own fair share of assassins in the past. There were loose connections to various illegal groups, including Yakuza, the Triad, and the Russian mob. Nagisa shivered as he read one particular name: Die Schwartz Schweine. Nagisa could distinctly remember his own dealings with them.

Nagisa stood on the roof of the club entitled La Mariquita. He could feel the loud bass of music rocking the whole club, and the sounds of young adults (not much younger than him) celebrating their youth. His eyes scanned the crowds exiting and leaving the club, looking for a particular face. Anyone who didn't know this club would just take it at face value. However, Nagisa was not one of those people. He knew that this club was simply a front for the Mexican operations of the German-based Schwartz Schweine.

A contractor, who may or may not be the Mexican government itself, had ordered the assassinations of key players in this organization. It would not kill their operations entirely, but it would at least slow them, allowing for the government to then step in.

A tall man stepping outside of the club with a woman on each arm caught his attention. His dark brown hair wasn't remarkable, but the striking tattoo on his neck certainly was. Nagisa quickly pulled out his binoculars. A black pig. Bingo. He scowled as he pulled out his sniper rifle. He was a decent shot, but he didn't want to risk harming the women. He would have to rely on a physical hit-and-run tactic. He holstered the gun, instead opting for a knife.

The man was approaching his car, unknowingly distancing himself from any crowds that he could use to grab attention. Nagisa observed as the two women began to struggle. He gritted his teeth, he needed to wait. The moment wasn't here yet. He had to wait for the moment. One of the women screamed. Nagisa's grip tightened. Not yet. He watched the man lean in close and place a wet kiss on the other woman who slapped him. He roughly grabbed her. Now.

Nagisa launched himself from the rooftop, startling a particularly drunk couple who had come out to enjoy each other's company. He had hundreds of hours of physical training to thank for his skills. He swiped at the man's throat just as he pulled one of the women towards him. The knife hit a solid surface.

Nagisa was briefly stunned as he realized that his assassination attempt had failed. The man grinned and let his grip on the women loosen. The two ran off. He slowly turned around, revealing a flesh-colored neck guard.

"It's an honor to meet you in person," Nagisa recognized him now. This was Carlos Torrez. He was the second-in-command to Balduino Lucio, the ringmaster. Shit, he had been operating on bad intelligence. This was supposed to be the head of "security", not anyone higher. A bead of sweat dripped down his forehead.

"I suppose you've noticed my movements?" Nagisa said, hoping to find an opportunity to either complete the assassination or escape.

"There is nothing that escapes the sight of the Black Pigs." He gestured downwards. Nagisa didn't take the bait. He knew that snipers had their guns trained on him. If he guessed correctly, there were probably two snipers, one at four o'clock and another at ten o'clock. "Your talents are unmatched. I've heard that you took down a prominent member of the Yakuza, and you were only 16." Nagisa was silent, though he was a bit disturbed that such details about his life were so readily available on the underground circuit. "Your talents could be better utilized under the Black Pigs. I'm sure we'd pay more handsomely than your contractor, after all."

"I'm not interested," Nagisa said firmly. He never took jobs he had moral questions about. Lovro once commented that his moral compass was ironic in a job where he took people's lives. Nagisa flexed his fingers. He had an idea, but he had to be careful. He needed to brace himself.

"What a shame to lose such a promising assassin at such a young age." He raised his hand, ready to give the signal for the shots. I sure hope this works. He braced himself. Carlos's hand came down, and the shots rang out. They tore through his bulletproof vest, leaving him with what would undoubtedly be a scar later. Minimum four seconds to reload. Through the pain he pulled two smoke grenades out from his pockets, activating them immediately. He pulled his pistol out, shooting in the directions that the shots had been fired. He heard one grunt, confirming a hit. The other bounced off of a building.

He sidestepped Carlos, who had his own gun out, ready to strike. He wasn't listening, Nagisa could tell. The man had backed up against a car, preparing himself for an attack from the front. Nagisa instinctively lightened his footsteps. The smoke screen would last only another minute and it was sure to be catching the attention of local law enforcement.

Before Carlos knew what had happened, Nagisa was at his side. "You don't mess with my prey," he whispered before the gunshot rang through Carlos's head.

Nagisa sighed as he looked down at his stained clothes. This was why he preferred a knife. Now there was just one more loose end. Using the speed he had honed from years of training starting at a young age, he launched himself towards the sniper. A younger man sat terrified as he made eye contact. Nagisa smiled.

"Let the rest of the Black Pigs know that their time is limited."

Nagisa instinctively rubbed the bullet scar. It had been a dumb risk, but he had prevailed. The next day, one-by-one, he took down key leaders of the Schwartze Schweine. Lovro had once told him that once an assassin had earned a name, they'd never have a shortage of job opportunities. From that encounter on, he was simply known in the underground circuit as The Blue Viper.

Nagisa skimmed over the report two more times. Father died in a car accident two years after he joined the government. Old colleagues perishing in freak accidents. Managers taking new jobs far away from Tokyo. No matter how the evidence piled up, it was hard to throw away his conflicted feelings.

He had known his target through high school, after all. They weren't the best of friends, but it was hard not to know and be familiar with someone that had been in the same class as you for three years. Still, given his upbringing, it was hard not to imagine this order coming in one day. If there was going to be someone bringing him down, it may as well be himself. Nagisa's shaky resolve became firm.

Asano Gakushuu's time was officially limited.