1boy, 3girls, aqua_eyes, ass, beach, bikini, black_hair, blonde_hair, blush, breasts, casual_one-piece_swimsuit, cleavage, covered_navel, day, flying_sweatdrops, hand_on_own_cheek, hand_on_own_face, male_swimwear, mask, medium_hair, mouth_mask, multiple_girls, one-piece_swimsuit, ponytail, print_swimsuit, short_hair, surfboard, surgical_mask, swim_trunks, swimsuit, yellow_bikini