2girls, aged_up, arm_up, bare_shoulders, bikini, black_hair, blank_eyes, blonde_hair, blue_eyes, blue_sky, bob_cut, bow, bow_bikini, breasts, cleavage, cloud, cloudy_sky, day, fang, frown, girls_und_panzer, gloom_(expression), groin, holding, holding_innertube, innertube, katyusha_(girls_und_panzer), leaning_forward, long_hair, looking_at_another, looking_back, medium_hair, multiple_girls, navel, nonna_(girls_und_panzer), omachi_(slabco), open_mouth, outdoors, red_bikini, short_hair, side-tie_bikini_bottom, sky, smile, standing, strapless, strapless_bikini, swept_bangs, swimsuit, waving, white_bikini