1girl, bench, blush, breasts, brown_eyes, brown_hair, cleavage, collarbone, fundoshi, girls_und_panzer, hiyama_yuu_(wee259hiyama), japanese_clothes, looking_at_viewer, navel, no_bra, on_bench, open_mouth, outdoors, sawa_azusa, short_hair, sitting, small_breasts, solo, sweat, tan, tanlines, yamakasa