2girls, air_bubble, akiyama_yukari, barefoot, bikini, bikini_skirt, breasts, brown_eyes, brown_hair, bubble, closed_mouth, day, frilled_bikini, frills, girls_und_panzer, halterneck, looking_at_another, looking_back, medium_breasts, messy_hair, multiple_girls, mushinosuke, nishizumi_miho, red_bikini, short_hair, side-tie_bikini_bottom, smile, submerged, sunlight, swimsuit, underwater, water, white_bikini