.Kokoro-Keseki.
It was just a robot that was made but a bright but lonely scientist
"Just abit more tweaking and..." The young scientist adjusted a few more cords. "Done!"
The female humanoid robot opened her eyes.
You could say his creation was...a miracle.
"Yes! I did it!" The scientist smiled and stuck out his hand for her to shake. "Hello there!"
She only stared at it, then stared back at her creator.
"...Heh." He sighed and slowly put his hand down.
But there was still one thing missing.
"Oh! I have lots to show you!" The scientist said, grabbing a shovel and a small potted tree he had sitting next to the door. "I'm glad you were born this time of year! It's when the cherry blossoms are in bloom!" He seemed very excited, like a child. Actually, you could call him a child; he would be turning 14 soon.
One thing you cannot duplicate
"Come on now! We have to finish this before it gets dark!" He was beaming.
The robot nodded and followed after him.
"Here we go!" He stopped, putting the shovel and plant down.
The scientist started digging a hole.
"What are you doing?" The robot asked.
"I'm planting a cherry blossom tree, now is the perfect time to do it!"
"Okay."
Once the hole was deep enough, he picked up the plant and set it in the hole. "I can't wait for you to see when they are in bloom! You'll love it!"
"What is 'love'?"
It is what they call a heart, the missing program.
"Oh, love?" He put the shovel down. "It's... It's like when you get a warm feeling in your stomach, and you can't stop looking at the thing that made you feel that way."
"I do not understand."
"Heh, I didn't expect you to." He ruffled her hair. (Scene his creation was taller then himself, he had to get on his toes.) "You see, humanity is a beautiful thing, and having emotions makes it all the better. That's why I've already started a special project for you."
"What is it?" She asked.
"It's called 'KOKORO', in other words, your heart. I hope I can finish it soon though..." He looked down, as if deep in thought. "Oh! I forgot to tell you your name!"
"What is it?"
"Rin Kagamine." He said. "Oh, it's already getting dark, we better go back home." He took her by the hand and led her to the small house he called home.
Several hundred years past scene that day; I am alone, with my creator gone..
The miracle robot looked around the empty house. It really needed a good dusting... Spider webs were all over the now cracked walls and dust covered the PC monitor. She went and got the duster out of the closet and started to dust. She was careful around the PC; her creator said that was one of the most important things in making the KOKORO, he also said it was one of his most important things, besides her, of course.
After she finished dusting, she walked over to the door, (well, where it used to be, after awhile, it eventually fell off) and looked out at the cherry blossom tree. She did this every day, as her creator told her too.
"Now that it's planted, you and I can look out every day to see how big it's gotten! Pretty soon, we'll have a lot of beautiful sakura flowers!"
It was now a large tree, clearly over 100 years old.
I want to know...
She silently walked outside to look at the tree. The shovel that her creator had used to plant it was, surprisingly, it was still there, in the exact same spot he left it.
What that man had been...
She walked closer to the shovel. It was very rusty, and it looked like it would turn to dust if you even touched it...
Making for me, until the end of his life...
After some time of standing still and looking up at the blossoms on the tree, she turned to go back inside.
The PC turned on, which was odd, considering it hadn't been plugged in...
She walked over to the PC and looked at the screen.
"The miracle begins...!" The screen read.
Slowly, she placed a hand on the screen.
Why did you treat me so kindly? I did not understand then.
Images popped up on the screen of a girl who looked just like herself with a boy that looked just like her creator. They both looked very young, maybe ten years old.
Then an image popped up of that same girl in the hospital, smiling weakly at the robot...

Then, finally, a picture of a gravestone reading "Rin Kagamine." A boy was sitting in front of it, tears running down his pale face.
"...I-I..." The miracle robot hunched over as tears ran down her cheeks.
Why am I shaking like this? Why wont these tears stop?
She put a hand over her chest and felt a beat against her palm.
Is this what I had hoped for? My very own Kokoro...?