kei (keigarou), hatsune miku, hatsune miku (if), vocaloid, concept art, highres, 1girl, alternate costume, aqua hair, aqua necktie, black thighhighs, blouse, collared shirt, hair between eyes, half updo, headphones, long hair, multiple views, necktie, plaid clothes, plaid skirt, ponytail, prototype design, shirt, shoulder tattoo, sideways mouth, simple background, sketch, skirt, sleeveless, sleeveless shirt, tattoo, thighhighs, twintails, very long hair