sora to umi, izumi konata, kobayakawa yutaka, narumi yui, lucky star, > <, > <, 00s, 3girls, :3, = =, alternate hairstyle, armpits, arms up, bikini, blue hair, braid, closed eyes, cloud, cousins, day, family, finger to mouth, flat chest, green eyes, green hair, long hair, multiple girls, one-piece swimsuit, outstretched arms, pink hair, short hair, short twintails, siblings, sisters, swimsuit, twintails, water, x3