"Hiroshima ni Ichiban Densha ga Hashitta" is a poignant anime series set in the aftermath of the atomic bombing of Hiroshima on August 6, 1945. The narrative centers on the efforts to restore the city's tram system, which serves as a symbol of resilience and hope for the survivors. The story begins shortly after the bombing, depicting the devastation and the immediate struggle for survival faced by the citizens. Amid the ruins, a group of tram workers, led by the determined protagonist, Takeshi, takes on the monumental task of repairing the damaged tram lines and getting the city's transportation system running again.

Takeshi, a skilled tram operator, is driven by a deep sense of duty and a desire to bring normalcy back to Hiroshima. His character is shaped by his experiences during the war and his personal losses, which fuel his commitment to the restoration project. Alongside Takeshi are several other key characters, including Yuko, a young woman who lost her family in the bombing and finds purpose in assisting the tram workers, and Mr. Tanaka, an elderly engineer whose expertise and unwavering spirit inspire the team. The series also introduces various survivors whose lives intersect with the tram project, each contributing their own stories of loss, perseverance, and hope.

The plot unfolds as the workers face numerous challenges, including scarce resources, physical and emotional trauma, and the lingering effects of radiation. Despite these obstacles, the team perseveres, driven by the belief that restoring the tram system will help rebuild the community and provide a sense of continuity for the survivors. The series meticulously portrays the technical and logistical difficulties of the project, as well as the emotional toll on the characters as they confront their grief and memories of the bombing.

As the tram gradually becomes operational, it serves as a powerful metaphor for the city's recovery and the indomitable spirit of its people. The final episodes depict the first tram running through Hiroshima since the bombing, a moment that encapsulates the themes of resilience, unity, and the enduring human capacity to rebuild in the face of unimaginable tragedy. Through its focus on the tram project, the series offers a nuanced exploration of the aftermath of the atomic bombing, highlighting both the collective and individual struggles of the survivors while emphasizing the importance of hope and perseverance.