1003_(ralto_0014), 1girl, d, arm_behind_back, bikini, breasts, brown_hair, cleavage, double_bun, hair_bun, idolmaster, idolmaster_cinderella_girls, looking_at_viewer, munakata_atsumi, navel, open_mouth, purple_eyes, red_bikini, santa_bikini, short_hair, small_breasts, smile, solo, swimsuit, teeth, upper_teeth_only