1girl, armpits, ass, blue_eyes, blush, breasts, casual_one-piece_swimsuit, cowboy_shot, ear_piercing, from_side, grey_hair, hand_up, idolmaster, idolmaster_shiny_colors, kawai_ritsu_(rits_meg), looking_at_viewer, one-piece_swimsuit, piercing, serizawa_asahi, short_twintails, sideboob, simple_background, small_breasts, solo, swimsuit, swimsuit_skirt, twintails, twitter_username, white_background