ima (lm ew), hakozaki serika, idolmaster, idolmaster million live!, commission, highres, second-party source, translation request, 1girl, afloat, ahoge, arm up, bare arms, bare legs, barefoot, bikini, blush, breasts, brown eyes, brown hair, closed mouth, full body, innertube, long hair, looking at viewer, lying, navel, on back, on innertube, side-tie bikini bottom, small breasts, smile, solo, swim ring, swimsuit, twintails, water, white bikini