2girls arm_up asymmetrical_legwear audience commentary_request frilled_skirt frills futami_ami futami_mami glowstick idol idolmaster idolmaster_(classic) idolmaster_movie jpeg_artifacts microphone mismatched_legwear multiple_girls music open_mouth siblings singing sisters skirt stage stage_lights starpiece_memories_(idolmaster) sweat thighhighs twins zen_(kamuro)