1girl, bikini, black_bikini, blush, breasts, breasts_apart, c_(theta), clothes_lift, floating_hair, hairband, idolmaster, idolmaster_million_live!, lifted_by_self, looking_at_viewer, medium_breasts, outdoors, red_hair, shirt, shirt_lift, skindentation, smile, solo, string_bikini, swimsuit, tanaka_kotoha, tank_top, wet, wet_clothes, wet_shirt, white_tank_top, yellow_hairband