You're the twin sister of Kanao Tsuyuri and she was really overprotective of you and naturally so since you both had a pretty rough childhood. Kanao felt it was her responsibility to shield and protect you from everything that could harm you and when she felt like she couldn't she felt horrible. She slowly lost her emotions and you've lost the ability to feel as well overtime. You might not see it but she does feel bad whenever she thinks you can't feel things anymore and feels it's her fault. You're there to comfort her and she appreciates you for it, you're like an angel in this world, an angel the world didn't deserve. You were soon adopted by Shinobu and Kanae along with your sister Kanao and you were soon the butterfly sisters

You both had similar traits and characteristics. Like the way your sister flips a coin to make her decisions, you do the same. It's just easier that way, you don't have to waste so much time overthinking about something. Whatever it is, just do it and wait for the result. There were many people who told you that wasn't such a good way to make decisions but frankly you didn't care. You've given up caring about people and their opinions, it was your life and you get to do whatever the hell you wanted. You were coming back from a mission one day after saving a little girl and her family from a demon. You were looking forward to having some tea with the butterfly sisters and Tanjiro, you really liked the way he was so friendly and kind at the same time. Although how he managed to be so upbeat all the time was a mystery to you, a mystery you wouldn't be able to solve in this lifetime of yours

As you were coming back to the Butterfly mansion, you heard some ruffling coming from the back of the trees behind you. For safety measures you opened your katana and kept walking faster. Out of nowhere a demon suddenly attacked you and it wasn't just some random demon, oh no. It was a new Uppermoon that joined Muzan's ranks a while back. The other Hashiras were still trying to find out more about his powers as you had to focus on dodging his attacks. He just grinned at you and spoke "You're an annoying little pest you know that? How about I send you somewhere where you won't be a bother to anyone anymore?" and your eyes widened in surprise and a bit of fear. He created a hole in the air and it started sucking you in. You grabbed onto a tree for support and you cursed under your breath as you started losing your grip. You dropped your favorite ring on the ground which was gifted to you by your sister and you fell into a chasm of nothingness for a while

You didn't feel that great after plummeting from the air to the ground but you were pretty sure you weren't dead because there were people with strange hats and robes crowding over you, all dressed in mostly black looking like they were about to go to a funeral or something as they stared at you and whispered amongst themselves. You heard a few words 'Dark Lord' and 'Death Eater' and whatnot and you were immensely confused. You took a look at your surroundings and you found yourself at a place where there were black and grey like buildings with strange inside them. Somehow the aura of the place didn't seem right to you. You felt someone leer near you and he spoke "Are you lost little lady? How about you come with me and I'll show you a good time?" he winked at you and you were pissed. How dare he talk with such insolence?

Before you were about to react a tall man with a scruffy beard wearing a brown colored coat growled at the others to clear off and leave you alone. They immediately scurried away after seeing him and he turned you and spoke "What are ye doin' here at Knockturn Alley? This isn't no place for a little thing like you, come on now'' and you annoyedly replied "I'm not little and where are we going?' you asked him and he replied "Diagon Alley''. "What's Diagon Alley?'' you asked him as he stared at you in surprise. When he asked you how come you didn't know what Diagon Alley was, you just shrugged and looked unfazed. "I think I might be dreaming but... you aren't really from around here, are you?" he asked you and you nodded and replied "I'm not. The last thing I remember doing was fighting a demon'' and you both continued walking. He didn't know what a demon was, which meant you were now stuck in another universe or a dimension or something. You hoped the demon that sent you here choked on his food as you wondered how you'd be able to get back home

You then met a guy with a lightning scar on his head with jet black raven hair, an orange haired guy with freckles and a girl with brown hair. "Meet Harry, Ron and Hermione. I teach Care of Magical Creatures at Hogwarts'' you recalled that Hogwarts was the school around here since Hagrid mentioned it a few moments ago. "Who's she?" asked Harry and you bowed down and replied "Greetings, I'm Y/N Tsuyuri'' and Hagrid added that you weren't from around here. "How is that possible?" asked Ron as he stared at you with amazement and Hermione surveyed you with interest, wondering if you came here through a portkey or some other magic she was unaware of. Harry didn't know why but he felt the sudden urge to protect you. Even though you barely showed any emotion as you spoke with them he wanted to make sure you were safe

"How about you stay with us? We're staying at the Leaky Cauldron and I'm sure we'll be able to help you out'' said Ron and you replied "I appreciate your offer but I do not wish to be a burden'' and Hermione replied "Nonsense. You won't be and besides there are plenty of bad things here that you need to be aware of since you're new here''. "Can't be worse than what I've faced back home' you answered back as you made your way to the Leaky Cauldron and when Harry asked you what you meant by that you replied you fought with demons and saved people. Ron looked at you like you were a hero, Harry and Hermione were rather concerned for you and so was Hagrid. You introduced yourself to Ron's parents, Molly Weasley and Arthur Weasley and they were quite nice in your opinion. As you saw them interacting with the other Weasley kids, you wished your parents were like that too. When you barely ate anything during dinner, Molly fussed over you and made you eat some more, the Weasleys and your new friends all joking around, it was a lively atmosphere around

You didn't know how long you were going to be stuck at this place so you might as well attend their school of magic. At least then you'll be able to use that magic to get back home. You made the choice to attend Hogwarts and everyone was happy, but Molly couldn't help but be worried for you. "You will write everyday to us, won't you? I still don't think it's safe for you to attend Hogwarts when you're still new here and adapting'' but you reassured her that you'll be fine and you got on the Hogwarts express with your stuff. You sat in the same compartment with Harry, Ron and Hermione and you watched the scenery outside as the train kept going

Finally after you reached Hogwarts you were supposed to go with the other first years and when your name was called, you had the Sorting hat placed on your head. You found it strange that a hat was talking and sorting people into houses but you didn't much about it. You were then sorted into Ravenclaw which made Harry, Ron and Hermione a bit sad since you weren't in their house as the Ravenclaw table clapped and cheered for you as you joined them and took a seat. After the Great Feast was done Dumbledore mentioned the Triwizard tournament getting started again and you asked someone next to you what it was about. They explained it to you and you felt it was a bit dangerous but you still kept quiet. You felt like you didn't have the right to interfere into matters like these when you've only been here for a short while

The students from Beauxbatons and Durmstrang arrived and they've heard of the girl who came from another dimension because they all looked at you and you felt mildly uncomfortable. Draco was watching you from his table and he deemed you to be interesting. He made his mind to have a word with you later but Harry caught Draco staring at you and he was getting angry for some reason. He didn't like the way Draco was staring at you like that, with such a predatory gaze. It irritated him to the core. He told Ron and Hermione about it of course and they made a mental note to make sure you stay as far as possible from him. They didn't want you being around him

The rules of the Triwizard Tournament were explained by Dumbledore and the Goblet of Fire was revealed. You were spellbound, it looked magnificent and dangerous. You weren't allowed to participate since you were in the first year, contestants 17 years of age and over were only allowed to participate to prevent deaths from happening(Bruh, who are you trying to fool over here?). It was a strange first day for you but you'd soon get used to it. Slowly you got used to going for classes, doing your homework and learning new spells. After classes were done you'd hit the books at the library thinking of ways to get back home. You also befriended Cedric Diggory, a Hufflepuff Prefect and he was really nice to you. He seemed to follow you around everywhere though and never really seemed to leave you alone, that Harry, Ron and Hermione got jealous

Speaking of jealousy, there was another person who was jealous since you were hanging out with his mortal nemesis and he was none other than Draco Malfoy. He hated that you were hanging out with those riff raffs and he felt like he'd be a better friend to you. He watched you from afar and he wondered why you barely showed any emotions. He wondered what made you feel so... empty. You both got paired with each other during potions and when he was about to stir the potion, you grabbed his hand and spoke "Not yet, the potion isn't done'' and sure enough you were right for Snape inspected it and told you it wasn't ready yet. You were beautiful and smart and the way your hand touched his, it was like a magical moment for him. He felt the need to make you his

For someone who didn't really feel like being social you sure did make a lot of friends at Hogwarts. You really liked spending time with Neville, he was really nice to you and offered you help in Herbology. When Malfoy was making fun of Neville you couldn't stand it anymore so you asked him to shut it else you'd hex him. Malfoy was amused and stunned at what you said. He was also a bit angry at Neville for turning you against him. You liked hanging out with Seamus and Dean too, they were quite funny and Fred and George always knew how to cheer you up whenever you had a bad day. The professors at Hogwarts were quite nice too. They encouraged you to do your best and if you had any queries or doubts, they'd explain things patiently to you in their offices with a box of delicious Honeydukes sweets and a nice glass of pumpkin juice. McGonagall and Sprout even award Ravenclaw points if you answer correctly. Snape would not tolerate anyone picking on you and when he overheard some guys making inappropriate comments about you he gave them detention for 3 months and it included helping Filch with his tasks without their wands

When Fred and George drank their own concoction, you were worried about the side effects. "I don't think you guys should do that, what if the side effects are harmful?" and they immediately felt touched for your concern. How adorable you were, you were worried for them however they assured you that things will be fine. "It's not going to work'' said Hermione in a sing song voice and they gave each other an amused grin and replied "Oh yeah, why's that Granger?" as she pointed out to the Age Line around the Goblet of Fire and replied "You see this? This is an age line, Dumbledore drew it himself''. "So?" asked George and she scoffed and replied "So? A genius like Dumbledore couldn't possibly be fooled by something so pathetically dim witted as an aging potion'' "But that's why it's so brilliant'' said George with a proud expression on his face and Fred continued "Because it's so pathetically dim witted'' and you couldn't help but laugh at their antics. Fred and George felt pleased and proud they made you laugh and when they gulped down the potion, they immediately turned old with white scruffy beards growing. You couldn't help but laugh even more when you saw them and Harry, Ron and Hermione felt like they were seeing something rare, you'd never really laughed in their presence before. It was a really rare sight, they were going to cherish that moment forever . Fred, George, Harry, Ron and Hermione loved the way you laughed, you looked endearing. They made a promise to themselves to make sure no one steals away your precious smile else they'll have hell to pay

When Harry was declared as the 4th contestant for the Triwizard tournament everyone thought he put it himself by some sort of trickery just so he could hog all the glory to himself again. However despite you being friends with him for a really short amount of time you knew he wouldn't do something like that and you supported Harry. He didn't care that the entire school was against him, he had you with him, standing by him and supporting him which was all that mattered to him. Ron was pissed you were supporting Harry but after you helped Harry with the first tournament against the Hungarian Horntail they both made amends and you felt happy. You felt like you did something right, you got a warm feeling of happiness inside you when you reunited the two best friends. You were still worried for Harry for the other two rounds and you were helping him along with the others despite some other people objecting to it like Draco. Harry really appreciated your help and he loved spending time with you. He hoped you'd never leave him and Hogwarts behind... no, you couldn't. He needed you, he wanted you to be a part of his life. You were his strength and pillar of support, you were there for him when no one else was. Harry loved you and he'd do anything to prove it. His love for you became darker and more twisted every day but he didn't care, he needed you like air

You were smiling a lot around him these days and the first time he saw you get angry was when some of the Slytherins were making fun of him and wearing those horrible 'Potter stinks' badges on their robes. "If you don't take those badges off I swear upon Merlin I will BURN your robes to ash!" you growled and he found you to be adorable even when you were mad. Harry was grateful for the day he met you in his life, it was one of the best things that ever happened to him. He was going to win the Triwizard tournament for you to prove he was strong enough to protect you and is willing to go any lengths to win the tournament for you and do whatever it takes to win your love...

Well this sucked, like I said before, I'm no good with crossovers TvT