4girls, ball, beachball, blue_hair, blue_shorts, blush, brown_eyes, brown_hair, cloud, competition_swimsuit, dated, day, denim, denim_shorts, eyebrows_visible_through_hair, green_eyes, green_hair, grin, hair_between_eyes, hair_ribbon, holding, holding_ball, holding_beachball, innertube, long_hair, multiple_girls, ocean, one-piece_swimsuit, partially_submerged, ribbon, school_uniform, serafuku, short_sleeves, shorts, sky, smile, sportswear, swimsuit, swimsuit_under_clothes, twintails, twitter_username, water, white_ribbon