5girls, afloat, ahoge, ass, barefoot, bikini, blue_bikini, blue_eyes, blush, bow, breasts, brown_hair, butterfly_hair_ornament, cleavage, eyewear_on_head, from_above, go-toubun_no_hanayome, green_bikini, hair_bow, hair_ornament, holding, holding_water_gun, innertube, large_breasts, long_hair, looking_at_viewer, megami_magazine, megami_magazine_deluxe, multiple_girls, nakano_ichika, nakano_itsuki, nakano_miku, nakano_nino, nakano_yotsuba, ocean, one_eye_closed, open_mouth, orange_hair, ponytail, purple_bikini, purple_eyes, quintuplets, red_bikini, short_hair, siblings, sisters, sitting, smile, soles, standing, star_(symbol), star_hair_ornament, striped, striped_bikini, sunlight, swimsuit, thighs, wading, water, water_gun, wet, yellow_bikini