koutaro, original, commentary request, 1girl, :d, arm support, bare arms, bare shoulders, black hair, blue one-piece swimsuit, breasts, brown eyes, chair, cleavage, collarbone, competition school swimsuit, full body, hair bobbles, hair ornament, long hair, looking at viewer, medium breasts, on chair, one-piece swimsuit, one side up, open mouth, school chair, school swimsuit, shoes, sitting, smile, socks, solo, swimsuit, tan, tanline, uwabaki, white background, white shoes, white socks