Sasuke is a college student and a history nerd who has made a hobby out of studying time slips. One day, he slips through one of these time slips and finds himself in the Sengoku Period, although it's nothing like what he's read about in the history books. He takes the name Sarutobi Sasuke and becomes a retainer of the infamous Oda Nobunaga. His first mission is to win the confidence of Nobunaga's other famous retainers, Toyotomi Hideyoshi and Tokugawa Ieyasu.