Regarded in Japan as the definitive novel of the period it portrays, it tells about the fall of the Tokugawa shogunate, an event precipitated by the arrival of Commodore Perry's Black Ships, and the early years of the Meiji Restoration.

Following a character modeled closely after Tōson's own father Shimazaki Masaki, the novel carries its story through the turbulent decades before and after the fall of the Tokugawa shogunate sparked by the arrival of Commodore Perry's ships in 1853.

The protagonist Aoyama Hanzō, a devout follower of Hirata Atsutane's idealistic nativism but tied down by his duties as the head of Magome-juku, observes the tide of events leading to the opening and Westernization of Japan.

Hanzō, fearing that Japan's native values and way of life will be discarded and forgotten by future generations enamored by things Western, is driven insane by despair and ultimately dies after being imprisoned by his own family.

In their review of the novel, Publishers Weekly said that "the author's supreme achievement is to dramatize wrenching social and political change at the level of individual response" and that what made the story so readable is the "viable link between event and character, coupled with Toson's limpid, low-key style".