kmy-3 (kumayu), vertin (reverse:1999), reverse:1999, highres, 1girl, balloon, black hat, blue bow, blue necktie, boater hat, bow, breast pocket, closed mouth, coat, collared shirt, confetti, diagonal-striped clothes, diagonal-striped necktie, gloves, goggles, goggles on headwear, grey background, grey eyes, grey gloves, grey hair, hair bun, hand up, hat, hat bow, holding, holding balloon, lab coat, looking at viewer, necktie, object in pocket, official alternate costume, pen in pocket, pocket, shirt, short hair, single side bun, smile, solo, striped clothes, striped necktie, upper body, watermark, white coat, white shirt