1girl, armpits, arms_up, ball, beachball, blonde_hair, blue_one-piece_swimsuit, blurry, blurry_background, blush, breasts, collarbone, green_eyes, holding, holding_ball, idolmaster, idolmaster_cinderella_girls, looking_at_viewer, mariabowl, name_tag, one-piece_swimsuit, pool, sakurai_momoka, school_swimsuit, small_breasts, solo, swimsuit, upper_body, water_drop