After settling his differences with a Japanese PoW camp commander, a British colonel co-operates to oversee his men's construction of a railway bridge for their captors - while oblivious to a plan by the Allies to destroy it.
Kanichiro Yoshimura is a Samurai and Family man who can no longer support his wife and children on the the low pay he receives from his small town clan, he is forced by the love for his family to leave for the city in search of higher pay to support them. In his search he joins a notorious clan, known as the Shinsengumi where he does as much as possible to get money.
During the time of change of the mid-19th Century, Yaichiro is bid farewell by his fellow samurai friends Munezo and Samon as he leaves their clan's fiefdom on the northwest coast of Japan (Unasaka) to take an important position within the shogunate in far away Edo. Munezo has lived modestly with his mother and sister Shino after his father was forced into suicide after the failure of a bridge project. Kie, a farm girl serves them as a maid in their house. As time passes, Munezo's sister marries Samon, his mother dies, Kie is married into a merchant family, and he is required to learn western methods of warfare such as the use of artillery and firearms from an official sent from Edo.