In 1868, the final year of the Bakumatsu Period, the warriors of the Shinsengumi are back into action, as the true enemy shows themselves from the shadows. The Kiheitai, a group of jouishishi extremists who wanted to overthrow the Bakufu and destroy the rotten world. Takasugi Shinsaku, the leader of the Kiheitai, who was revealed to be none other than an old comrade of Gintoki from the past. He is actually not a human, but he's not a demon either. He is something else that the Shinsengumi has never faced before. The Shinsengumi, with Chidori at their side, took part in the Boshin War to decide the future of the Tokugawa Shogunate against the rise of the Imperial Nationalism and the extremist group led by Takasugi.