1girl, berserkert, black_hair, blue_one-piece_swimsuit, blush, brown_eyes, closed_mouth, covered_navel, flat_chest, hair_ornament, hairclip, heart, idolmaster, idolmaster_cinderella_girls, looking_at_viewer, one-piece_swimsuit, sasaki_chie, short_hair, simple_background, solo, standing, swimsuit, thighs, white_background