今日は隠れた歴史的記念日！？ Happy 'Back to the Future' Day! October 21, 2015 と、手塚治虫の「２０１５年という（驚くべき）設定」...and Tezuka Osamu's astonishing futuristic setting in 2015 in 'Jetter-Mars' as animation sequel of 'Astro Boy…