1girl, arms_behind_back, bare_shoulders, casual_one-piece_swimsuit, ear_piercing, flat_chest, frilled_one-piece_swimsuit, frills, full_body, gengorou, greyscale, hair_over_one_eye, idolmaster, idolmaster_cinderella_girls, monochrome, one-piece_swimsuit, piercing, shirasaka_koume, short_hair, simple_background, smile, solo, swimsuit