hirano katsuyuki, igrius, spectral (series), spectral souls, highres, official art, 1girl, ahoge, black eyes, black hair, black thighhighs, cleavage cutout, clipboard, clothing cutout, female focus, flat chest, full body, garter straps, glasses, hair up, high heels, lab coat, long coat, miniskirt, open clothes, pen, pencil skirt, shadow, shoes, short hair, simple background, skirt, solo, standing, thighhighs, turtleneck, white background, zettai ryouiki