On September 15, Keicho 5, a young man, Musashi (Takezo), whose life was ruined by the war in Sekigahara wandered around like a wild beast. Only his lover Otsu and the pacifist monk Takuan understood Musashi, who escaped from the hands of the Ochimusha hunters and turned against everyone. Then, a crisis loomed over Musashi as he fled into the mountains. At the same time, in the village of Jokyoji in Echizen, the sword prodigy Sasaki Kojiro, in his quest for strength, had defeated his own master, Tomita Seigen, and got out of the village.

The one who hurriedly ascended the castle upon hearing news of Shogun Tsunayoshi's illness was Saotome Mondonosuke. However, instead of an illness, he was prompted to consider a marriage proposal with Yaehime, a daughter of the Date clan. Yet, this was merely a pretext, as he was requested to investigate the truth behind the rumors of rebellion within the Date clan. Mondonosuke, who took on this task to stave off boredom, accompanied by his retainer Kinai, departed for Mutsu, following the procession of Yaehime returning to her home province. However, remnants of the Toyotomi faction, already plotting the overthrow of the shogunate, had gathered under Kii Koya Bunzaemon…