1girl, o, blush, breasts, brown_hair, covered_navel, double_bun, groin, hair_bun, holding, holding_towel, idolmaster, idolmaster_shiny_colors, large_breasts, looking_at_viewer, nihakusanren, one-piece_swimsuit, school_swimsuit, simple_background, solo, sonoda_chiyoko, swimsuit, towel, twintails, water_drop, white_background, white_towel