1girl, adachi_(nogami_nono), blue_one-piece_swimsuit, blush, braid, braided_bangs, breasts, collarbone, competition_school_swimsuit, covered_navel, forehead, holding, holding_towel, idolmaster, idolmaster_cinderella_girls, looking_at_viewer, one-piece_swimsuit, school_swimsuit, school_uniform, seki_hiromi, small_breasts, smile, solo, swimsuit, towel, wavy_hair, white_towel