"Tenpō Suikoden NEO" is set during the Tenpō era of Japan, a period marked by widespread famine, corruption, and social unrest. The story centers on a group of outcasts and rebels who rise against oppressive authorities in a struggle for justice and survival. The narrative unfolds in a fictionalized version of Edo-period Japan, blending historical elements with dramatic fiction.

The protagonist, Shōzō, is a former samurai turned outlaw after being framed for a crime he did not commit. Disillusioned by the corruption of the ruling class, he becomes a leader of a ragtag band of rebels known as the "Neo Suikoden." This group comprises individuals from various walks of life, including peasants, merchants, and former criminals, all united by their shared suffering under the tyrannical regime. Each member brings unique skills and perspectives, contributing to the group's efforts to challenge the status quo.

The plot is driven by the group's escalating conflict with the Shogunate and its enforcers, who are determined to crush any dissent. Key antagonists include ruthless officials and mercenaries hired to eliminate the rebels. The story explores themes of loyalty, sacrifice, and the moral complexities of rebellion, as the Neo Suikoden navigate treacherous alliances and betrayals while striving to protect the downtrodden.

As the rebellion gains momentum, the group faces increasingly dire challenges, including internal strife and external threats. The narrative builds toward a climactic confrontation that tests the resolve and unity of the Neo Suikoden. The series balances action-packed sequences with moments of introspection, delving into the personal struggles and motivations of its characters. Through its portrayal of a turbulent historical period, "Tenpō Suikoden NEO" offers a compelling exploration of resistance and the human spirit.