Rule 34 Dev - 00s 1girl 4boys black_hair blush copyright_name glasses itoshiki_kei itoshiki_majiru itoshiki_mikoto itoshiki_nozomu itoshiki_rin long_hair looking_at_viewer multiple_boys non-web_source oil-paper_umbrella sayonara_zetsubou_sensei short_hair siblings sweatdrop umbrella|660877893