Gaiakitan is a period drama that takes place in 17th century Japan, where Sanada Yukimura is seen gathering his group of ninja called the "Sanada Ten Braves," a decade after the Battle of Sekigahara. The plot revolves around a ninja called Kirigakure, who is skilled and enigmatic and is persuaded to participate in Yukimura's revolt against the Tokugawa clan against his will.