1girl, bandaid, bandaid on face, bandaid on nose, black skirt, blouse, blush, brown pantyhose, chalkboard, collarbone, equation, frilled shirt, frilled sleeves, frills, geometry, grey hair, long hair, long sleeves, looking at viewer, math, off-shoulder shirt, off shoulder, pantyhose, parted lips, puffy long sleeves, puffy sleeves, shirt, skirt, solo, twintails, white shirt