tenneko yuuri, otomachi una, voiceroid, highres, 1girl, armpits, arms up, ball, beachball, bikini, bikini skirt, blue eyes, blue hair, blue sky, blush, bracelet, cloud, day, flat chest, hair ornament, hairclip, holding, holding ball, holding beachball, jewelry, long hair, looking at viewer, navel, ocean, open mouth, outdoors, sidelocks, sky, smile, solo, swimsuit, tan, tanline, twintails, very long hair, visor cap, wading, wet, white bikini