"Bokutachi no Peace River" is a narrative-driven anime series set in a post-apocalyptic world where humanity struggles to rebuild after a catastrophic event known as the Great Collapse. The story centers on a group of survivors who band together to navigate the harsh, lawless landscape in search of a fabled sanctuary called Peace River, rumored to be a place of safety and prosperity. The journey is fraught with danger, as the group faces hostile factions, scarce resources, and the lingering effects of the Collapse, which has left the environment unstable and unpredictable.

The protagonist, Haruto, is a former engineer who becomes the de facto leader of the group due to his resourcefulness and technical skills. His pragmatic approach often clashes with the idealism of Aoi, a young woman who believes in the inherent goodness of people and strives to maintain hope within the group. Their dynamic is further complicated by the presence of Ren, a mysterious drifter with a dark past, whose motives remain unclear but whose combat skills prove invaluable. Other key members include Yuna, a medic with a strong sense of duty, and Tetsuo, a former soldier grappling with guilt over his actions during the Collapse.

As the group travels, they encounter various settlements, each with its own struggles and ideologies. These interactions highlight the moral ambiguities of survival, as the characters are forced to make difficult choices that challenge their principles. The series explores themes of trust, sacrifice, and the resilience of the human spirit, often juxtaposing moments of camaraderie with the harsh realities of their world.

The plot is driven by both external conflicts and internal tensions within the group. Flashbacks reveal the personal histories of the characters, shedding light on their motivations and the traumas they carry. The search for Peace River serves as both a literal and metaphorical journey, symbolizing the characters' quest for redemption, purpose, and a sense of belonging in a fractured world. The series concludes with an open-ended resolution, leaving the ultimate fate of the characters and the existence of Peace River ambiguous, emphasizing the uncertainty of their world and the enduring struggle for hope.