Hatamoto Ooka Gentaro was deeply committed to a future with a beautiful girl named Omachi, a relationship facilitated by his love of the shamisen. Omachi was stalked by a ronin named Akiyama Kanosuke, and at one point, Gentaro and Akiyama dueled at Matanuiyama, but the confrontation was left unresolved when Omachi, sensing urgency, called the authorities. Meanwhile, Gentaro's uncle, Kii-no-kami, concerned about Gentaro's whereabouts, ordered him to investigate a conspiracy by Tachibana Tadama, a tyrannical director of Hachijo who exercised his power oppressively in Shimousa Iioka. Gentaro attempted to leave on a journey with Omachi but was obstructed by his uncle's retainers.