1boy 1girl :< blue_hair blush boku_no_imouto_wa_osaka_okan brother_and_sister can't_be_this_cute can't_be_this_cute can't_be_this_cute can't_be_this_cute crossed_arms fang hair_ornament hairclip ishihara_kyousuke ishihara_namika killing-inthe-name long_hair looking_at_viewer namesake ore_no_imouto_ga_konna_ni_kawaii_wake_ga_nai parody school_uniform siblings skirt style_parody twintails