sei (pixiv), sei (resonableworld), black rock shooter (character), hatsune miku, black rock shooter, vocaloid, 10s, 1girl, belt, bikini, bikini top only, black bikini, black hair, blue eyes, breasts, chain, cleavage, coat, female focus, front-tie top, gloves, glowing, glowing eye, glowing eyes, hood, hooded jacket, jacket, katana, long hair, midriff, navel, short shorts, shorts, small breasts, solo, star (symbol), swimsuit, sword, twintails, very long hair, weapon, zipper