Disclaimer: I do NOT own Black Jack. All I own is my OC, whose name is Ai.

WARNING: For those people who hate OC pairings, this is NOT the story for you.

This is mainly based on a BJxOC pairing.

Enjoy the Story and Please Review! This is my first REAL Story that I share to the world so please send suggestions on my writing!

Chapter 1

To everyone else, it was a windy, sunny morning, just a perfect day for the start of a four-day weekend. But to a certain person, it's just another dark, meaningless day he's living in. he's been lying on his bed for hours, and that time it was at 9 in the morning. He looks at the ceiling, having flashbacks of the news of his patient's death again and again. What did I do wrong?! I did everything correct! The operation was flawless! Why?!?! His mind screamed again and again, preventing him from sleeping the whole night. He sat up, banging his fists on his blanket-covered knees.

"Why?! Is it my fault? I didn't find any flaw! Why did this happen?!" He shouted again, his mind off reality and still stuck to the past. Although he knew that it was a car accident, he still blames himself. His most recent patient, who had a Chronic Kidney Disease, was healed from the transplant and was released out of the hospital last Wednesday. Unfortunately yesterday, the same patient died in a car accident. The police was sure that the cause of his death was a car accident, and they had proof. He knows it, but he just couldn't convince his mind. His mind was always thinking that he did something wrong to weaken his patient's reflexes or sight or anything that might've affected the patient's driving. He fell back, lying on his bed again. He rolled his body to face his left, just after the wooden door slowly opened, letting in some intense light in the dark room and the silhouette of a person standing by the door.

Stepping in was his new companion, who was with him for more than half a year already. Who came in was a teen girl wearing a dirty light green smock over her white T-Shirt and short dark blue skirt. Her hair was aquamarine blue, with white hair hanging over her forehead and in each side of her face. The wind from outside the door blew her hair to the right, revealing the scar she has on the left corner of her forehead. She wore a frown, clearly about to shout.

"Kuroo-kun!" She shouted, calling him by his first name. No one has called him by his first name after his bomb accident except her. Even though she was 12 years younger than he is, he didn't really care. Respect and manners was never really his thing. "Come on! Don't be so lazy! It's already 9!! WAKE UP!" She shouted, storming towards him and pulled off his white blanket.

"Stop telling me what to do you crappy little air-headed girl." He said, clearly annoyed and stressed. But it seems that she had ignored that and grabbed his arm. She pulled his arm really hard, and finally Black Jack gave in. He immediately went off of his bed and stood up, his arm still in Ai's grasp. She pulled him out of his room and released when they arrived at the dining table. Black Jack rubbed his arm, checking to see if any part of his arm is broken. For a teenage 13 year old girl, Ai can be very, very violent, explained by her past. Black Jack sighed in relief, knowing that his arm has nothing wrong but a tiny muscle strain. He sat down in one end of the dining table, looking at his brightly lighted surroundings before looking down to his breakfast-slash-lunch. Everything was way too bright to his eyes, but to Ai, it was such a beautiful day. And Black Jack noticed that when she sat down on the other end of the table, holding her plate on her hands and wearing a cute smile on her face. On most days Black Jack can't help but smile along with her, but today all he did was stare at her deeply. She shot him a freaked-out look before filling her mouth with a piece of omelet.

"K-Kuroo-kun? A-are you okay? You've been staring at me for a while without touching your food." She finally asked after about five minute of receiving weird, creepy stares from the black-and-white haired doctor. He finally snapped out of it and looked down at his food. There was omelet on his plate, a bowl of rice, a cup of tea on his left and some silver utensils, including black wooden chopsticks. Ai can't help but stare at him this time, wondering what on earth is up in the complicated doctor's mind. But Black Jack ignored it. Her reason for staring at him was perfectly rational, but his reason… Well, he doesn't have a reason. He himself had no idea why he was staring at her so intensely.

So the extremely bright day continues and Black Jack was recording his patients' medical records on the table nearest to the window. He reached for his cup of coffee, which was sitting on the table some distance away from his papers. As he sipped a bit of it, he heard a commotion outside. Setting down his coffee, he looked out the glass window and saw Ai and Largo hanging laundry outside, laughing and running at times. Ai's laugh was really loud, but it was innocent and cute. Black Jack put down his pen and decided to watch for a while. For more than 10 minutes he watched her jump up and down to hang the laundries on the wire she can't seem to reach. She once fell down when she accidentally landed on Largo's tail and was immediately startled by Largo's howl. That almost made him smile, and he did, but because of something else. Seeing her smile instead of getting angry at Largo had made the doctor think about her acts better. Especially the one she made this morning.

He then realized something. Ai knew that lying in the darkness of his room in silence will only feed his stress, guilt and rage and cast a shadow in his heart. He realized that Ai has been trying to make him feel better, which apparently in his eyes seem to be annoying. He remembered the reason why he needs her so much.

Well, what do you know. That crappy little girl actually knows how to take care of me, he thought to himself, seeing her smile widen as her sight met with Black Jack's rare, irreplaceable smile.

That was the first Chappie! Please Review!!

And PLEASE look at my other stories too! Thank you for your support!

I will be updating as soon as I'm done with my Homework

And I will upload the fanfic that this story is based on after I'm done with this fanfic and my other one. But if there are lots of people who wants me to work on it early, then I will be happy to :D