-many years ago-
"Are you sure I am ready for this Princess?" A little edger filly asked looking up at her teacher.
"Yes Twilight I am, you have made a lot of progress over the last 3 months so I believe you are." Celestia's said with a warming smile as she stepped back to give Twilight some room just in case the spell backfired.
"Ok then, here goes nothing" she locked onto her target in her mind and focused all her magic into one point on her horn. She then tried to place herself in that spot, but Discord was up to his old tricks and changed the spot as she began teleporting. He ended up beaten, blooded and lost a talon from the fight he had with a very angry Celestia once she found out he was the cause of the mishap.
Meanwhile, Twilight opened her eyes in unfamiliar territory. "This isn't the royal garden..." She thought to herself. She heard a noise behind her and used her magic to throw a branch, causing whatever it was to yell "OW!" Out from the bushes came a young creature, about 10 or 11 from her guess, and walked on two legs.
"What kind of creature are you? I demand you tell me…" Twi said as she was charging another spell, but at her statement the thing stopped and laughed.
"You have never seen a human before little unicorn? I know what you are from old myths, just didn't know you could use magic, my name is Kakashi by the way."
"I'm Twilight, Twilight Sparkle, but you can just call me Twi, now where am I?"
"I see you are not from this universe huh? Well you are in the woods just outside of Kohona, "The Village Hidden in the Leaves". I am on the way back from a training mission, and you are welcome to join me since I will not be getting back until dark, so you should not be seen once we arrive."
"Actually, I can teleport and become invisible, so it would not be a bother anyway. You said you are returning home from a training mission, for what?"
"That is pretty cool, and you see, I am trying to train to become a ninja, just like my father."
"Ninja?"
"Yeah, they are also known as shinobi and are the protectors of the village. So tell me Twi, what is your world like where you came from?" She then spent the next couple of hours explaining every single detail about Equestria, from the Princess to her studies, her trying to get her Cutie Mark, explaining what that is, Canterlot, her friends, everything. When she was done, and much to her surprise, he had absorbed a lot of knowledge and was interested in going to visit. When they got to the village, it was dark. He led the way to his house and his dad, called White Tiger, answered the door.
"You are actually early son and who is your friend? Come inside and get warm, it is gonna be unseasonably cool tonight."
"Thank you kind sir." Was all Twilight could say since she was shocked a total stranger had been so open to her being there and being so kind. Eventually White Tiger asked the same question Kakashi had, but to her shock and gratitude since she wouldn't have to repeat herself, Kakashi explained the whole situation to his dad, and his reaction was the same as his son's, he believed everything.
"Well Twilight, considering the circumstances, you are welcome to stay here until you can get back home, but I have to take you to the Hokage in the morning, deal?"
"Hokage?"
"The leader of this village." White Tiger flatly replied. "They serve the same role, from what you told me, as the princesses of your home world."
"Oh...well White Tiger, we have an accord and I will go with you to the Hokage in the morning." They shook on that note and true to her word she went with him the next morning to see the Hokage, whose name was Minato. White Tiger explained everything and Minato was understanding, even promising on Celestia's (by the info he was told) teachings she would not be used as a weapon unless she wanted to. She thanked him over and over again until she nearly collapsed from lack of oxygen. Meanwhile back in Canterlot, Celestia was frantically searching for a way to return her student home.
It took some adjusting, but by the time she was in Kohona for a month, Twilight had started helping Kakashi's team, (him, a kid named Obito, and a girl named Rin) by using her magic (which had strengthened as well) to throw objects at the group. They were called Team Minato, and she even helped Minato in his training exercises. She missed her home, but she was happy with her temporary lifestyle. However, as they say, all good things eventually come to an end.
-5 months later-
It was spring and Twi, by staying invisible, had just returned from her first mission with Team Minato, which she actually enjoyed. She felt good about herself and the friendship she had built with her team (being made a honorary member) and wanted to see White Tiger right away. She had over the last 5 months seen him as a second dad for taking care of her and often called him dad. When she reached her house, she bust the door open, Kakashi right behind her, and yelled out "hey dad!" with a smile, but it faded when there was no response. Meanwhile back in Canterlot, Celestia was jumping with glee. "My student is about to return home!"
Back in Kohona, Twi and Kakashi got very worried. "Something does not sit well about this..." They told each other as they heard a groan, and there, on the living room couch, was White Tiger. Minato, Obito, and Rin had arrived by this point. The scene before them was gruesome, White Tiger was beaten and had lost a lot of blood. Twi had since learned basic medical jutsu (which surprised her and everyone else that she could) and she tried her best to stop the bleeding, combining the jutsu with her magic to increase its effect, but to no avail.
"He has lost too much blood." Twi choked back that thought, but was interrupted by a bright flash. When it died down, she saw the one face she had missed but didn't want to see at this moment, Princess Celestia.
"Twilight Sparkle! I have found you after a week of frantic searching, let's go home my star pupil."
Everyone stood there in shock then politely bowed. "So you're Princess Celestia I presume? Twi has told us a lot about you, I swore on your teachings that she would not be made into a weapon, I never thought I would meet you in person to tell you" Minato said.
"Why yes I am and thank you so much. Who is this person she is trying to save?"
Kakashi answered. "My father, White Tiger,and he has lost a lot of blood and she is trying to save him. I found her when she arrived in the forest not to far from the village and my dad was the one who took her in over these last 5 months. She considers me a brother and him a second father. Likewise, I consider her a sister and he considers her a daughter."
"Oh...I see..." Was all she could say at that statement when White Tiger, barely conscience, turned and spoke to the Princess.
"Celestia, I would bow but I'm on the brink of death as you can see. I'm glad I got to meet you in person, just didn't think it would be under these dire circumstances."
"It is quite alright all things considered, I'm glad to meet you as well, thank you so much, for you kept her safe. It is by royal degree from this day forward that all of you that helped are honorary citizens of Equestria."
White Tiger spoke again, this time to Twilight. "Twilight, you have brought me joy these last 5 months, for you were like the daughter I never had, and even in death I will consider you my daughter. I love you Twilight, now it is time for both of us to go..." At that, he laughed once more, then passed with a smile on his face. Everyone in the room, even Celestia, starting crying at the scene they just witnessed. Twi immediately went into denial.
"Dad, no...no..No...NO! There must be SOMETHING I can do!" She tried all her spells and jutsu, to no avail.
Celestia then turned to Kakashi. "What is your name little one?"
"My name Kakashi."
"Considering what just happened, I wasn't even prepared for this, I'm gonna let Twilight, who you consider your sister, stay the night to mourn. We leave out first thing tomorrow though, are you ok with that?"
"Yes ma'm! Thank you Princess! Just one last thing.."
"No problem, and what is it that you want?"
"I want to visit your world before I die, to see what it is like in person"
"I can't make no promises...we will just have to wait and see."
"Thank you Princess Celestia." They all stayed there for the night, and as Celestia said, they returned to Equestria the next morning, but not before some more goodbyes that would make anyone's feels hurt. When they returned home, Celestia was curious about how the time difference was and how much stronger her student had become.
"Different universe, different laws...." Was Twi's response, "and if you don't mind, can have a week off to mourn?"
"Of course Twilight" Celestia said, but she also thought to herself. "Something tells me we will see them again..."