fictional sister, hatsune miku, kagamine len, kagamine rin, vocaloid, 00s, 1boy, 2girls, :o, aqua hair, arm up, beach, blonde hair, blue eyes, blue sky, brother and sister, cloud, day, detached sleeves, headphones, headset, looking at viewer, looking back, multiple girls, neckerchief, ocean, outdoors, parted lips, sailor collar, school uniform, serafuku, shore, short hair, siblings, sky, spread fingers, twins, twintails, water, waving