chikuwa (kakidamari), amami haruka, hoshii miki, takatsuki yayoi, idolmaster, idolmaster (classic), 3girls, ass, ball, beachball, bikini, blush, bracelet, breasts, cleavage, closed eyes, frills, hair ribbon, innertube, jewelry, leaf, looking back, multiple girls, o-ring, o-ring top, ocean, open mouth, outstretched arm, polka dot, polka dot bikini, polka dot swimsuit, ribbon, see-through clothes, side-tie bikini bottom, smile, submerged, swim ring, swimsuit, wading, water