hayakawa harui, hiiragi kagami, hiiragi tsukasa, lucky star, 00s, 2girls, :d, beach, bent over, casual one-piece swimsuit, cloud, collarbone, day, hug, hug from behind, long hair, looking at viewer, multiple girls, one-piece swimsuit, open mouth, outdoors, pink eyes, purple hair, sand, shore, short hair, siblings, sisters, sky, smile, snad, standing, sun, sunlight, swimsuit, thighs, twins, very long hair, water, waving