uki atsuya, hatsune miku, kagamine len, kagamine rin, kaito (vocaloid), megurine luka, vocaloid, highres, 2boys, 3girls, aqua eyes, aqua hair, arched back, ball, bare shoulders, beachball, bikini, cloud, contrail, day, from behind, hair ribbon, halterneck, long hair, looking back, multiple boys, multiple girls, nail polish, ocean, outdoors, palm tree, partially submerged, partially underwater shot, ribbon, side-tie bikini bottom, sky, sparkle, string bikini, striped bikini, striped clothes, swimsuit, tattoo, tree, twintails, underwater, vertical-striped bikini, vertical-striped clothes, very long hair, wading, water, waves