5girls, ball, bare_shoulders, beachball, bikini, bikini_skirt, black_bikini, black_ribbon, blue_eyes, blunt_bangs, blush, breasts, brown_hair, butterfly_hair_ornament, cleavage, closed_mouth, collarbone, cup, dot_nose, drinking, drinking_straw, floral_print, go-toubun_no_hanayome, green_bikini, green_ribbon, groin, hachiroku_(hatirokusann86), hair_between_eyes, hair_ornament, hair_ribbon, hand_on_own_hip, hand_up, hibiscus_print, high_ponytail, holding, holding_ball, holding_beachball, holding_cup, holding_innertube, innertube, leaning_forward, medium_hair, multiple_girls, nakano_ichika, nakano_itsuki, nakano_miku, nakano_nino, nakano_yotsuba, navel, one_eye_closed, open_mouth, pink_hair, print_innertube, purple_eyes, quintuplets, red_bikini, red_hair, ribbon, short_hair, siblings, side-tie_bikini_bottom, simple_background, sisters, smile, star_(symbol), star_hair_ornament, strap_gap, striped, striped_bikini, swimsuit, teeth, thighs, upper_teeth_only, vertical-striped_bikini, vertical_stripes