Shinji Nakaoka, the youngest son of the Nakaoka family, lives in Hiroshima amid the escalating turmoil of World War II’s final years. His position as the third son frames a childhood steeped in the harsh realities of wartime Japan, where his innocence starkly contrasts the brutality surrounding him. The family’s marginalization—spurred by his father’s vocal opposition to the war—forces them into poverty and social isolation. Shinji contributes to their fragile survival, laboring in the wheat fields with his father, Daikichi, and older brother Gen. These moments of shared toil become quiet acts of defiance, the growing wheat a fragile emblem of hope against despair.

On August 6, 1945, the atomic blast buries Shinji, Daikichi, and sister Eiko beneath their home as firestorms consume the city. Brother Gen and mother Kimie claw through rubble and flames in a futile attempt to save them, leaving the survivors haunted by their helplessness. Shinji’s abrupt death fractures the family, anchoring the narrative in visceral loss and the irreparable rupture of war.

His absence lingers as Kimie and Gen grapple with grief. Their decision to adopt Ryuta, an orphan eerily mirroring Shinji in appearance, reveals a desperate attempt to mend their shattered bonds. The act underscores how Shinji’s memory—both a ghost and a guide—shapes their struggle to endure in a broken world.

Though his life is brief, Shinji crystallizes the narrative’s exploration of war’s indiscriminate cruelty, particularly toward civilians and children. The wheat he once nurtured evolves into a recurring symbol: scorched by the blast yet later sprouting anew, it mirrors the family’s faltering steps toward resilience, intertwining his legacy with their precarious survival. His story, ending in ashes, amplifies the tragedy of innocence obliterated and the enduring scars borne by those left behind.