The great daimyo Yago clan───. A clan that reigned as daimyo for generations, and during the Sengoku period produced many wise rulers, making it the foremost civil administration daimyo house of the era. Yet now, even that illustrious family has been swallowed by the endless sea of blood that is the Sengoku period, leaving not a trace of its former self.

The 12th-generation head, Yago Naritada, died of illness, and his legitimate son, Kazumasa, became the 13th-generation head. At first, he was a civil administrator like his father and predecessors. However, worn down by repeated wars with neighboring states and uprisings, his policies grew more extreme day by day───.

And eventually, he transformed into a tyrant who imposed oppressive rule, going so far as to suppress rebellions and behead the ringleaders along with their entire families. Sakinawa Masanari, the head of a fortress village called Sakinawa within the Yago domain, declared war against the Yago clan alongside the villagers in order to stop this tyranny.

One spring in a certain year, at the Sakinawa Manor───.