1girl, bikini, blue_bikini, blue_eyes, blue_hair, breasts, collarbone, idolmaster, idolmaster_million_live!, idolmaster_million_live!_theater_days, karua_(karua23), light_blue_hair, long_hair, looking_at_viewer, shiraishi_tsumugi, simple_background, sitting, small_breasts, solo, swimsuit, wariza, water, white_background, white_hair