1girl, bikini, black_hair, blue_bikini, blush, breasts, cleavage, collarbone, day, floral_print, frilled_bikini, frills, idolmaster, idolmaster_shiny_colors, knee_up, light_smile, long_hair, looking_at_viewer, medium_breasts, mitsumine_yuika, navel, outdoors, sitting, solo, swimsuit, ushimo_(dztu8434)