Tatsuyuki Nagai is a Japanese anime storyboard artist and director. He made his full directorial debut in 2006 with Honey and Clover II, after which he had directed 2007's Idolmaster: Xenoglossia, 2008's Toradora!, 2009's A Certain Scientific Railgun, 2011's Anohana: The Flower We Saw That Day, 2012's Waiting in the Summer and 2013's A Certain Scientific Railgun S.