Standard Disclaimer: I own nothing in regards to Harry Potter or Jujutsu Kaisen. All properties therein are those of their creators. I am only a writer working on my skills with worlds and characters that I love.

Note: Yes, I know I have a lot of stories on my page, but this idea came in like an ear-worm and I couldn't let it go before writing something for it. And after writing it I wasn't going to not post it. Not sure if it'll go everywhere I want it to but I recently started catching up on the manga for Jujutsu Kaisen and my appreciation for Suguru Geto has grown in leaps and bounds so can I really be blamed?

Note: Curse using Harry Potter. JJK Elements starting around Year Four. I've not done a Hogwarts Years story before so this should be a lot of fun.

Note: Anyone else think that Voldemort could be considered a special grade curse after his resurrection? Interesting to think who might get sent out after him….

Note: I was interested to learn that most Cursed Techniques apparently manifest between the ages of four and six per the manga.

Note: I've already finished writing the entirety of year one. Chapters just need editing.

Chapter One - What's Your Type?

Harry sat alone within his cupboard and stared out the keyhole at the family that played and laughed in the living room without him. His stomach cramped with hunger, eyes watering with tears, and throat bobbing with sobs as he lamented his horrible place in life. Only five years old, but he knew this wasn't fair and it wasn't right. He'd seen parents playing with their kids in the park and wandering the streets while he was forced to pull weeds, and it only heightened the knowledge that everything he knew was wrong.

Now all he had was these moments. These brief glimpses into the warm family that should have been his instead of the painful existence he'd been stuffed into. It was the only brief moment of life in his day, when he could pretend in his mind that he was Dudley, and his fat bully of a cousin was the one trapped in darkness.

This time, something was different however. Something was strange. As he watched on, the boy could perceive a strange haze beginning to grow around the Dursley's bodies that seeped to the ground and began to coalesce into a singular shape. Why couldn't his relatives see it? The red glow was right there for any who looked! The object continued to form, expand, and elongate until at last Harry saw a squirming pale mass of skin and teeth. It had no eyes that he could see, but it did have a wide mouth, two arms with clawed hands, and a serpentine body that ended in a tail.

To anyone else it would have been a horrifying sight, but for some reason Harry could perceive its emotions. It was angry, sure, but it was mostly hungry and curious. The boy could understand all of those emotions very easily. Plus, due to its appearance he was sure the Dursleys would call it a freak just like they referred to him. Shouldn't freaks stick together? If he could try to pet it, would it want to be his friend?

It was as if the little creature had heard his thoughts because as Harry watched, it began to crawl and slither its way over to his little door. To his surprise, it squirmed under the small crack beneath it without issue and suddenly the two were face to face, examining one another up close. "Well hey, little guy. What's your name?"

The creature's answer was a wide toothed grin.

"Ah, well, I guess it was a lot to think you could talk. How about Mr. Smile?" When he received no sign of disagreement he managed a small smile of his own before his stomach cramped once more and he curled up in pain. Again he was surprised as the curse crooned and leaned down to bump its head against him. "Thanks for trying to help, Mr. Smile, but I'm too hungry to play right now."

Mr. Smile crooned again before slithering down his body and shoving its head in his hand.

"W-What?" Harry wondered as he felt something new twinge inside of him. Some instinct that forced his fingers to clench on top of his new little friend's head. Before his very eyes Mr. Smile suddenly began to writhe and swirl in an ever decreasing whirlpool of energy until at last he remained not but a small orb in the palm of his hand. Still following the pull of both instinct and eternal hunger, the boy reached back and swallowed it in a single gulp. He cringed at the sour taste before two things became readily apparent.

First, he was no longer hungry. Indeed it felt as if he'd enjoyed a five course meal and desert. Second, he could feel Mr. Smile beneath his skin. Resting comfortably within him as if he was a dog that had curled up for a nap. Deciding to try something he imagined the creature coming back out of him and grinned as its head extended from his chest and out the oversized neckhole of his shirt. Another thought and it sank back inside him. Cool!

One Year Later

Harry smirked as his uncle literally crawled to the door in his suit to make it to work. It was a rule Harry had instigated in the house; no one was allowed to stand taller than him when he was in the room. Across from him his aunt jittered around making his breakfast and his cousin was already on the curb waiting for the bus to school having squeezed out of his window rather than risk coming down the stairs.

Everything had turned around for him after finding Mr. Smile and bringing him into himself. First had been a trial of experimentation. Over the first few months he'd learned several new and interesting things. No one else could see Mr. Smile, but he could still affect the world around him regardless. What was more, the creature would follow any order he gave it, verbal or mental. Over the course of long walks he'd witnessed a similar haze to the one that had created his little friend over countless other people, but only on two other occasions had he witnessed more creatures created that he had summarily added to his internal zoo as he called it. The best he could tell, each instance had been from people in bad moods. So perhaps negative emotions created the creatures over time? It was all guesswork but that seemed right to him.

From there he'd begun to work on his current circumstances. Ergo, slavery, starvation, and horrible treatment from his relatives. He'd started by sending his little creatures to torment the Dursleys. Small things at first. Objects moving around the room when no one was looking, strange sounds in the night, tires slashed and food poisoned. Eventually he'd moved on to actual pain. Beatings in their sleep, small cuts that came out of nowhere (Mr. Smile's claws were quite useful) and suddenly getting dragged across the floor with no warning.

Of course they'd blamed him, and eventually they'd tried to beat him to make it stop, only to find all three of his little friend's hoisting Dudley into the air and dragging their claws over his skin to carve small furrows in his flesh. They'd begged at once for him to stop, to spare their precious little Duddykins.

He'd acquiesced, and then set the creatures on the parents. By the end it was clear to all who was really in control in the home, and the lesson had only needed to be repeated once more before it sank into them all. Circumstances had only gone up from there. He'd moved into the master bedroom, all of his meals were prepared for him, and Dudley handled all of the chores. Life was bliss.

Now here he was, finally six years old, and for the first time in his life he felt like things were as they should be with him at the top of the heap. He was starting to understand the nature of things. His uncle had been the strongest, so he'd pushed him down. Now he was the strongest and he'd pushed the fat man down instead. It made sense. So he was rather surprised when after he finished his breakfast there was a knock at the door. Vernon had gone to work, Dudley was out of the house, and Petunia never had anyone over. Who could it be?

"Aunt Petunia, go trim the roses out back." At his order, the woman bustled quickly out of the kitchen and the house. He quickly wiped his mouth and moved to the door without opening it. At a glance all three of his creatures surrounded the frame and he asked through the wood, "Who is it?"

There was silence for a moment before a voice answered, "Wow, you've got three cursed spirits under your control? That's pretty neat."

"Cursed spirits?"

"Oh you don't know? They're those little creatures of yours."

In a flash Harry yanked the door open and beheld a tall blonde woman in a leather jacket. "You can see them!?" he questioned ecstatically.

The woman smiled and nodded. "Hell yeah I can. I was just taking my bike on down the road when I saw the concentration of cursed energy on this house and thought I'd take a look. Honestly, I didn't expect this in the least. Heck, I only know one other guy with cursed spirit manipulation techniques so this is a real treat for me."

"Cursed spirit manipulation?" Harry blinked, earning a look of curiosity from the interloper.

"You really don't know anything do you?"

"Not really, no."

"Hm… Hey, what's your type of woman?" The woman smirked delightedly, as if the answer was somehow the most important thing in the world.

"My type?"

"Oh, nevermind, you're really a little too young to have a preference I guess. Look, can I come in and explain this shit? It looks weird when an adult stands on a doorstep talking to a kid for a long time."

Harry supposed that was true and quickly swept her inside before pouring her a cup of tea. "Now can you tell me what all of this means?"

"Sure. I'm Yuki Tsukumo."

"Harry Potter."

"Nice to meet you. I'm what's called a Jujutsu Sorcerer. It means I'm a curse user and just from this brief examination I'd say you're the same. Cursed energy exists in everyone; people excrete it via the strength of their emotions. People like us can wield that power and use it in interesting ways. In your case, it seems like you can bind cursed spirits."

"Is that good?"

"It's great! And super rare too." Her eyes glanced out the kitchenette window to where Petunia worked on the roses, pure dark shadows stark under her eyes, her stress clear to see. "It seems you also learned to use it for your own ends."

Not knowing why, but seeking to justify himself to this strange woman, he said, "I only did what I had to to survive and get even."

She raised her hands in a gesture of peace, "Hey, I'm not judging. I'll be the first to admit that a lot of people in this world suck. I just want to know that you aren't planning to start hurting innocent people."

"I only hurt people who hurt me."

"A good rule to live by I suppose. Cursed spirits form out of the negative energy of humans. It's typically a gradual process but extreme distress, life threatening circumstances, or mass hysteria can expedite the process exponentially. There are different grades they can fall into based on their deadliness and jujutsu sorcerors fight them to protect humanity."

"Why would you want to protect humanity? Humanity sucks." Harry stated simply, as if it were the most obvious fact in the world.

Yuki leaned back and stuck her feet on the table as she pondered that statement. Just a cursory examination of her surroundings told her everything she needed to know about the situation, and she'd always been a pretty good judge of character. No photographs of this kid on the walls, a cupboard under the stairs with way too many locks, and the posture of someone only just learning to not expect a slap or whip for the wrong move. He was definitely new to holding power in his hands. Yeah, this wasn't a great place for someone starting out in the jujutsu world. Not at all. But what to do…. She didn't spend a lot of time at the jujutsu academies so taking him there wouldn't work, and at his age one of the clans was certainly likely to try and sink their claws into him, which would really just be a dick move on her part to subject him to.

There really was only one option left. "Tell you what, I'll explain more about this world if you want, but I'm on a bit of a deadline and I travel a lot for my job. Research and hunting aren't stationary positions after all. How tied to this place are you really?"

Harry quirked his head, "Not at all. Why?"

"Cause I could use a little assistant on the road. How about it? I'll teach you, train you up in new and exciting ways to use your powers, and in return you'll take notes for me."

"I would get to leave here?"

"Yes."

"Would I ever need to come back?"

"Not unless you want to, but I can't see why you would."

"And you'll teach me how to get stronger?"

"That goes without saying. You're an interesting kid and I'd like to see what you're made of."

Harry thought about it for a moment before walking out of the room. He came back in a few minutes later with a small backpack over his shoulder.

"What's that?"

"Everything I own. Let's go."

Yuki frowned at that piece of news. Maybe there was time to make her displeasure known to these people for how the boy had been treated before leaving. "Well, the first thing we'll do is take you shopping before we leave the country." She stood up, "Head on out to my bike. I wanna have some pointed words with that old lady by the roses."

Later that night Vernon returned from work to both a joyous and horrifying sight. It was joyous to find the Freak finally gone from their home and apparently never to return. Horrifying because Petunia was curled on the floor of the living room with all of her limbs broken and folded at clearly unnatural angles. After several hours in the ER he received the news that his wife would never walk freely again without the constant use of crutches.

At the same time their nephew was in the air aboard a private jet beside his new mentor, and for the first time in his life he found himself excited for whatever the future may hold.

Five Years Later

Hagrid walked unsteadily into Professor McGonagall's office with his hat in his hands, his fingers crumpling the unfortunate article as the Deputy-headmistress watched him from behind her desk. "P-Pardon me, P-Professor McGonagall maam, but I've run into a spot of trouble."

"Oh?" The Scotswoman set her quill back in its ink jar, slid the papers she'd been working on to the side, and gave the big man her full attention. "What seems to be the problem?"

"Headmaster Dumbledore sent me to deliver little Harry Potter's Hogwarts letter and get his school shopping done. He said he'd be right where we left him, but the Dursleys say he left years ago and they've not seen him since. They were quite rude about it, I must say."

Minerva could only stare in shock at his words. "H-He's gone?"

"Aye. So I took a look at his actual letter and wouldn't ya know it, the address written is completely different." He pulled out a very familiar envelope and handed it to his superior. "It's in a whole other country, and I have no idea where anything is there or how to travel in secret you see. I stand out don't ya know."

As she looked it over she asked, "Hagrid, why did Albus send you to Harry? Orientation for new students is my job."

"I'm really not sure, maam. To be honest it made me a bit uncomfortable too. Especially since he told me I wasn't to tell him too much about our world. He said it was so he could discover the magic of it for himself, but it just seemed odd to me that I shouldn't prepare him more."

"Yes, that does seem odd. You may go, Hagrid, I'll take it from here." When the half-giant left she examined the address more closely. What was the boy who lived doing in Germany? Well, she'd just see about this change in locale now wouldn't she? Putting together her usual stack of introduction paperwork and pamphlets she walked over to her flew, traveled to the ministry of magic, and hopped an international portkey to the Berlin Ministry where she registered in the country for a temporary visit and made her way out onto the bustling streets of the capital.

It took a while to get where she needed to, public transport was much different here than in England and it took some time to get the hang of it. Eventually though she found herself approaching a highrise apartment building and riding an elevator to the top floor. "Let's see, apartment number ninety-six." She reached the appropriate door and rapped her fist against it three times.

There was a bit of shuffling on the other end before the door opened to reveal a blonde Japanese woman in her twenties wearing a pair of black leggings and a tank top. "Kann ich ihnen helfen?" (Can I help you?).

"Apologies, but I do not speak German." McGonagall replied, earning a widening of the other woman's eyes.

"Oh thank god, my German is absolute shit." She laughed. "How can I help you?"

The Scot sniffed at such language, but nevertheless carried on her task. "Is Harry Potter here?"

"Why yes he is. Can I ask what this is about?"

"His schooling and his heritage."

"Well then, Harry!" The blonde called inside the apartment, "There's someone here to see you!"

"I'll be right out, Yuki!" A childish male voice called back.

"Come on in." Yuki stepped aside and invited the Scot into her living room.

As she entered and took a seat upon the couch, Minerva took note of the tasteful yet minimal decor. This place had the look of one that while warm and comforting, wasn't stayed in often. As the other woman took a seat on a nearby lounge chair she had to ask, "What is your relationship to young Mr. Potter?"

"I could ask the same of you." The blonde said with a raised eyebrow.

"I was a friend of his parents and a teacher at the school they wanted him to attend. Now answer the question." She palmed her wand in her sleeve stealthily, but from the slight tightening around Yuki's eyes she knew the other woman had seen the action.

Yuki put a finger to her chin, "I guess I'm his mentor? Big sister? Anyway I've been looking after him." She shrugged. "The people who had him sucked so I took him away and nabbed custody. They were only too happy to sign him away."

Minerva scowled. "I knew they were the worst sort of people." Her voice faded away as her eyes took in the sight of the young man she'd come to see rounding the corner of a nearby hallway. She'd not seen him since he was a baby, so his new appearance was a bit of a shock. He had the Potter's traditionally unruly hair, but he'd straightened it somewhat by growing it out and pulling it into a ponytail. For an eleven year old he seemed to be in remarkable shape, and he moved with the grace of a dancer, or perhaps a martial artist. Most children she knew tended to stumble around clumsily, but his feet touched the ground with the surety of one who owned it. He was dressed in a pair of black jeans and a red long sleeved shirt. Round rimmed glasses sat on the bridge of his nose, but they looked a lot sturdier than the wire rimmed variety that James had been known for.

She stood to greet him. "Mr. Potter?"

"Yes?"

"I am Professor MGonagall from Hogwarts School of Witchcraft and Wizardry." She held out her envelope, "I have your acceptance letter right here."

Harry took it, pulled out the contents and gave it a quick read. "Is this a joke?"

"Not at all." The witch pulled out her wand, gave it a wave, and sent a series of red and gold sparklers into the air. She expected the usual look of awe and delight, but instead the boy just looked bored.

"Well that settles it, I guess. How much is this going to cost?"

"Nothing, young man. Your parents paid your way the year you were born. They were so excited for you go there." There was the look of interest she'd been hoping for.

"You knew my parents?"

"I taught them both, and maintained a strong friendship with them after their graduation. I could tell you some stories if you'd like."

"I-I would."

"Very well. Now, I have come to confirm your attendance at Hogwarts this coming year." She eyed the other woman, "Something I imagined being far simpler before arriving here."

Yuki glanced down at her young charge and smiled, "How bout it, kid? Wanna study magic?"

He shrugged, "I'm not doing anything else. Might as well." As the Scot goggled at such a simple answer, the boy who lived and the Jujutsu Sorcerer shared a look. This was actually a great thing for them as they'd just been talking about what to do with him this coming year. They'd been traveling the world since packing up from England, studying, researching, exorcizing curses here and there, but the time had come for Yuki to return to Japan for a few months at least and she wasn't thrilled at the prospect of taking Harry into the domain of the major jujutsu clans. Between them and the academy heads there was no shortage of people that would try to gain some measure of control over someone with such a useful cursed technique. Especially after Geto had shown everyone just how useful it could really be.

Leaving him alone here also wasn't an option. She'd worked too hard to turn his former hatred of humanity to casual apathy and disregard with a slight superiority complex to let him regress now. Isolation was a sure way to do that. The two of them nodded, well used to their unspoken conversations, and the decision was made.

"What must be done now?"

Minerva gathered herself and answered, "I would take Young Harry to our English shopping center to gather his school supplies and from there I would direct him to where he will need to go to board the train to school. You'd be surprised how many first years get lost looking for it."

"Could that be done today?"

The witch nodded. "Easily. We have very fast and direct methods of travel."

Yuki eyed the boy, "How about it then, Harry? Want to head back to England for the day?"

"Why not? What about you?"

"Oh I have a gig I need to take care of at a local college. If I'm not back by the time you are then there are leftovers in the fridge."

"Alright."

Harry went to get his shoes and swiftly followed the Scotishwoman out of the building. "Does she always do that?" she wanted to know. "Leave you alone for long stretches of time?"

"No. Normally she takes me with her, but I don't think she wanted to keep you waiting."

"Oh. Well what does she do for work? I hardly expected to find you with a new guardian and I am curious."

"She's an exorcist." He answered simply. Harry figured that was the best way to explain it to a newby.

"An exorcist!?"

"Yeah. All around the world people report hauntings, curses, and mysterious deaths. She comes in and handles them when it benefits her."

"Curses and hauntings?" Minerva scoffed. "People put too much stock in them. I'll let you know that ghosts and spirits do exist but they are never malicious in intent. Their ability to touch the physical world is not substantial enough for that. Your 'sister' sounds like she is profiting off of the ignorant masses who do not know any better." Her tone made it clear what she thought of that.

"Oh really? Spirits cannot affect the physical realm, ey?" Harry's tone was full of humor for the first time since she'd met him. "Then how do you explain Mr. Righty?"

Minerva turned to where the young man was looking and beheld a red skinned ghoulish creature with one blazing eye on the right side of its head hanging off the ceiling and staring right at her. She gasped with shock and nearly fell on her behind as the young man began to chortle with laughter and the creature crawled down to crouch behind him.

Harry had learned early on that regular humans very rarely saw cursed spirits unless they were of a high enough grade, ergo the more dangerous they were, the more likely they were to be seen. Which was why Minerva still hadn't perceived Mr. Smile hanging onto his shoulder. He'd collected Mr. Righty in Serbia where he had been haunting a playground. Little kids, it seemed, were generators for negative cursed energy.

"W-What is that?" Minerva asked as she slowly raised her wand.

"I told you, it's Mr. Righty." Harry scratched the creature's chin and dismissed it into his shadow. The action seemed to appease his guide as she lowered her focus and made her way back to his side. "He's a cursed spirit that is bound to my control. You see there are malevolent spirits in the world and Yuki fights and researches them. She's taught me a lot about doing the same. This is actually one of the reasons things didn't work out with the Dursleys. I could see and control these spirits, and because of that they couldn't hurt me anymore or force me to work as they used to."

"T-They truly hurt you?"

"Yes."

"I am sorry to hear that. I swear I argued heavily against your placement there but I was overruled. This ability of yours though, is quite fascinating. I've never seen the like."

"Thank you. I'm rather proud of it. Let's keep walking and you can ask me more as we go."

And she did. As they traveled through the streets of Berlin and wandered the beauty of its magical ministry to the international travel stations, she pestered him for all the information she could about cursed energy, curses, and cursed spirits. She was astounded. A whole other society of people that could use magical arts, even if they were different from her own, it was incredible! She wondered if she could convince Albus to allow a semester sabbatical so she could travel to Japan and investigate?