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The defect: Crack on the front of the chest and top of the neck.Early symptoms of grayscaling.
Test Subject M39, also known as Not Miku, is a porcelain Vocaloid that was issued to the Grayscale Research Facility for experementation purpouses due to its defective nature.
It does not like to be called Miku as it thinks that due to its imperfections it would be a stain to the Miku name.