koutaro, original, 1girl, arm support, ass, bare shoulders, blue one-piece swimsuit, blush, brown eyes, brown hair, cameltoe, chair, desk, from behind, hair ornament, long hair, looking at viewer, loose socks, multicolored hair bobbles, old school swimsuit, one-piece swimsuit, one-piece tan, open mouth, school chair, school desk, school swimsuit, shoes, socks, solo, swimsuit, tan, tanline, uwabaki, white socks