kuca (ku ca18), original, absurdres, commission, highres, second-party source, 1girl, ahoge, armpits, arms up, bare shoulders, barefoot, beach, beach chair, black choker, black hair, black one-piece swimsuit, braid, breasts, choker, cleavage, closed mouth, covered navel, day, hair ornament, hairpin, halterneck, large breasts, long hair, looking at viewer, lying, o-ring, o-ring swimsuit, on back, one-piece swimsuit, orange eyes, outdoors, ponytail, reclining, shawl, smile, solo, spaghetti strap, strap gap, swimsuit, thighs, very long hair