"Azumi" is a historical action manga set in Japan's Edo period, written and illustrated by Yuu Koyama. The narrative centers on Azumi, a young woman trained from childhood as an assassin by a master named Jiji. Alongside a group of other children, Azumi is raised in isolation and rigorously trained in combat and survival skills. Their purpose is to serve as instruments of peace by eliminating warlords and other threats to the stability of the Tokugawa shogunate. The story begins with a brutal test of loyalty and skill, where Azumi and her peers are forced to kill one another, leaving only the strongest to carry out their missions.

As Azumi emerges as the sole survivor, she embarks on a journey fraught with violence, moral dilemmas, and personal loss. Accompanied by her fellow survivor, Nachi, Azumi carries out assassinations targeting key figures who threaten the fragile peace of the era. Her missions take her across Japan, where she encounters a variety of allies and enemies, including rival assassins, corrupt officials, and sympathetic individuals caught in the crossfire of political turmoil. The narrative explores themes of loyalty, the cost of violence, and the struggle to maintain humanity in a world defined by bloodshed.

Throughout the series, Azumi grapples with the emotional toll of her actions, particularly as she forms bonds with people outside her mission. Her relationship with Nachi evolves from camaraderie to a deeper connection, adding layers of complexity to her character. The manga also delves into the political landscape of the Edo period, highlighting the power struggles and shifting alliances that shape Azumi's world. The story is punctuated by intense, well-choreographed action sequences that showcase Azumi's exceptional combat skills, as well as moments of introspection that reveal her inner conflict.

The supporting cast includes Jiji, whose motivations and methods are often ambiguous, and a range of antagonists who challenge Azumi both physically and morally. The manga balances its historical setting with a focus on character-driven drama, creating a narrative that is both engaging and thought-provoking. "Azumi" is a compelling exploration of duty, sacrifice, and the human cost of war, set against the backdrop of a turbulent period in Japanese history.