The Fairy Ninja

"You have a special job for me?"
"Yes, after long deliberation, we have decided to send you undercover to an area very far away from here. It's a land without wizards so you will have to be careful and use your magic wisely, however, they do have their own form of so-called 'magic' called jutsu. It's fueled by chakra instead of ethernano, which is what turns itself into magic energy inside the body. You'll need to figure out how to use your magic and turn it into this jutsu they use. The people that use these jutsus call themselves Ninja, or Shinobi. You will be going undercover as a young ninja that is just starting out to become a full-fledged shinobi in a village called, The Village Hidden in the Leaf. We will give you a necklace that will give you the appearance of your thirteen-year-old self. This will be a very difficult task. It might even kill you. Do you accept the job?"
"Of course, I'm accepting it. From what you're going to be paying me, I might not need to work for a good ten years. What do I need to do, head councilman?"
"Very well. We have reason to believe that one of Zeref's demons has managed to make his way to their village and has learned how to use this so-called, chakra and jutsu. Your job is to kill this demon."
"Is this person actually a demon? You said you had reason to believe, meaning you aren't entirely sure."
"We aren't, although, we do know however that he has killed hundreds of people and that alone gives us reason to order that he needs to be killed, immediately."
"Alright, what's this guy's name?"
"Orochimaru."
"Alright, Orochimaru, you better watch out. Lauren Luna of Fairy Tail is coming after you."