NOTE: Hi there. Thanks for reading my story :) So I know there are already a lot of stories based on 'Karakuri Burst', but hopefully, I have done something different enough. I'm not sure how long the story will be as of yet, nor where it is heading, but I decided I will upload as I go. It will be written mostly in first person, alternating between the point of view or Rin then Len.

I covered my ears with my hands as the dreaded sound came closer and closer to the door of my cell. It was the echoing footsteps of my master. Sure enough, I heard soon after the sounds of several bolts being opened and the heavy, metal door creaked open. My eyes were not accustomed to the flood of light that came through, so all I saw was her silhouette in front of a rectangle of white. Her posture was proud and elegant, as usual, and her two long pigtails tumbled down neatly on either side of her head. Her name was Hatsune Miku. I trembled slightly as she stepped through the doorway into my gloomy cell.

"What is that smell in here?" She sniffed distastefully at the air. Day and night melded together as one in the dark dungeon which was completely cut off from the outside, so that I could not remember when was the last time I had gone out and been allowed to wash myself.

With no hesitation at all, she turned sharply and plonked herself onto the only chair in the room, and crossed her legs. I could feel her burning stare on the top of my head, and I shuffled forward to kneel down humbly at her feet. I did not dare to lift my head, so instead stared at the fishnet stockings which wrapped around her slender white legs.

"Ooof." I grunted involuntarily, as her foot came up under my chin, forcing my head up so that I was looking right into those hypnotic, bespectacled teal eyes of hers. They had a certain magnetic quality in them, which drew you in, and I felt like I was drowning in her deep, bottomless gaze. My head started spinning, and my shoulders sagged so that my white furisode slipped a little from my shoulders. Even my jaw felt loose and weak in her presence, so that a small trickle of saliva dribbled down the corner of my mouth. Miku took this all in, and her mouth curled up in a condescending smirk.

"Rin," She purred. "My sweet little puppet."

"Yes, master," I answered obediently. We both knew that I was completely in her control. Already, I could feel my insides becoming restless. My body trembled with longing as she slowly, teasefully, produced a vial from the pocket of her lab coat, containing the only liquid that could quench my thirst. She was reminding me of her power.

It had been this way ever since Miku forced me to undergo her 'experiment'. Initially, five boys and five girls had been chosen to undertake it. Our bodies were injected with a small sequence of artificial DNA, newly developed from Miku's lab. It was a sequence that transformed our ordinary human bodies into something more powerful, with greater reflexes and superior senses. The transformation process had been excruciatingly painful, and in a few days, half of us were dead. And as time wore on, the rest started to lose their minds and their health deteriorated. I do not know if it was a stroke of luck, or a mockery from the heavens, but I had been able to survive the treatment with still some of my humanity left. It had been a long process; at first they had to lock me up, as I was prone to going into fits of rage. The large permanent bruise around my neck was the result of one of my rampages, as I tried to break free of my restraints. And just before I was allowed to be released, to complete missions, Miku had given me one last test.

I still remember how she extended her long, perfectly-painted teal fingernail and forcefully dragged it down my face, through my left eye and over my nose. "Remember, Rin," She had said as I screamed out in pain. "I have now blessed you with superior healing. You must pass this test if you want to be worthy to be called mine." And she had turned and left me bleeding on the floor. I had screamed out again and again for help, but there was no one around to hear me.

She had come back to check on me, a week later, and sure enough, the wound was already completely healed. However, the eyesight in my left eye never returned and I was left with a large scar on my face.

"Rin, I have a very important mission for you," Miku now said. "There is a group of lowly humans who have been trying to meddle with my research and my creations. They will be appearing at the temple that is a day's walk south from here. I want you to go there, and destroy every single one of them."

My mind hardly took in her words. I was craving for my supply of fresh human blood. In particular, I wanted the blood provided by Miku, which had some sort of special ingredient added to it. It gave me a rush of adrenaline and warmth. Miku usually kept me starved for weeks on end, so that I was weak and helpless to any order she gave me.

"Did you listen to my order?" Miku demanded angrily, at my lack of response. Her foot now slammed down on my head, and I hit the floor with such impact that my ears were ringing.

"Y-yes, Miku," I said shakily.

"I want you to set out immediately," She said, before standing up. I risked a glance up at her, from my position, prostrate on the ground. She returned my look, over her glasses, and I could see her eyes were filled with disgust.

She casually dropped the vial she was holding, and I scrambled to catch it before it hit the floor. When I looked up again, she was already out the door. "Thank you, master," I called out after her. Quickly, I opened the vial and gulped down the dark liquid contained inside. Sighing with pleasure, I felt the strength returning to all my limbs. I stood up and walked calmly out of my cell door. I had a mission to complete.

** As always, the characters and general storyline are not of my creation, but based on those in VOCALOID, and in particular, the song 'Karakuri Burst'. I do not own these characters, etc**