takafuji aya, kal'tsit (arknights), arknights, official art, 1girl, animal ear fluff, animal ears, anime coloring, bare shoulders, belt, boots, breasts, brown belt, brown boots, cat ears, cat girl, closed mouth, collarbone, detached collar, dress, full body, green dress, green eyes, grey hair, hand in pocket, jacket, long sleeves, looking at viewer, off shoulder, see-through clothes, short hair, simple background, solo, standing, thighs, transparent background, white jacket