1boy, 3girls, ?, backboob, bikini, bikini_skirt, black_male_swimwear, blonde_hair, blue_eyes, blue_sky, blush, bow, breasts, brother_and_sister, brown_eyes, brown_hair, cevio, cloud, day, fang, feet_out_of_frame, frilled_bow, frilled_hair_tubes, frills, hair_bow, hair_bun, hair_ornament, hair_tubes, hairclip, hakurei_reimu, horizon, innertube, kagamine_len, kagamine_rin, kitsunerider, large_breasts, looking_at_another, looking_at_viewer, male_swimwear, multiple_girls, nose_blush, ocean, open_mouth, outdoors, pink_bikini, red_bow, satou_sasara, short_hair, siblings, sky, small_breasts, smile, sun, sunlight, swept_bangs, swim_trunks, swimsuit, touhou, twins, v, vocaloid, water, white_bikini, yukkuri_shiteitte_ne