Ishin Tosa Kinnō-shi (維新土佐勤王史; “The History of Tosa Loyalism in the Meiji Restoration”), based on a biography of Takéchi Hanpeita and biographical materials on other men associated with this history, was published in 1912 by a group of former Tosa Loyalists and other former Tosa samurai. 1912 corresponds to the last year of the Meiji era. Takéchi and his Loyalist Party, of course, played a major role in bringing about the Meiji Restoration of 1868, which was the beginning of the Meiji era.

I referred to this book in Samurai Assassins, particularly in Part II: The Rise and Fall of Takéchi Hanpeita and the Tosa Loyalist Party. The cover image shown here (but not the portrait of Takechi) is from The National Diet Library Digital Collection (国立国会図書館デジタルコレクション).