1girl, alternate_costume, ass, black_hair, blue_background, blue_eyes, blush, breasts, closed_mouth, from_behind, fundoshi, girls_und_panzer, glasses, gradient_background, hiyama_yuu_(wee259hiyama), japanese_clothes, rumi_(girls_und_panzer), short_hair, simple_background, small_breasts, smile, solo, white_background