(from ebookjapan):
A book titled "Kaikoku Shinsho" written by Hiraga Gennai, who supposedly died in prison, has been found! Researcher Yamanouchi and his student, Midori Yuzuriha, who obtained this mysterious old book, decipher it and uncover a series of historical facts that defy common sense! The infamous financial reform of the Shogunate by Iitsugu Tanuma was actually a highly praiseworthy achievement! Is Iiji the politician of the Showa period? This is a human drama that brilliantly interlaces the Edo period and the present day with the skillful direction and cutting expressions typical of Shotaro Ishinomori!