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…