Kanta Senō, younger brother to Junpei, grows up on Shikotan Island under the care of father Tatsuo, grandfather Genzō, and family servant Mitchan. His childhood is defined by innocent wonder and an inseparable bond with Junpei, spent exploring the island’s secrets and marveling at *Night on the Galactic Railroad*. When Soviet forces seize their home after Japan’s WWII surrender, the brothers escape into the novel’s cosmos—Junpei as Giovanni, Kanta as Campanella—transforming its starlit journeys into a shield against displacement.

Displaced to their stable while Soviet officers commandeer their home, Kanta’s playful spirit persists. Tension lingers, yet he tentatively befriends Russian children at school, his carefree smiles clashing with Junpei’s guarded demeanor. Both retreat into imagined worlds to endure their unraveling reality.

Deported to a Soviet internment camp, the family’s plight worsens. During a desperate bid to reach their imprisoned father, Kanta’s health falters, his weakening body an emblem of childhood’s fragility amid war. As Junpei pleads for medicine, Kanta slips away mid-journey. In his final moments, Junpei weaves their cherished story aloud, blurring fiction and reality until Kanta’s spirit merges with Campanella’s ascent aboard the spectral Galactic Railroad.

Years later, elderly Junpei returns to Shikotan’s shores, tracing memories at Kanta’s grave. The brother who once chased imaginary trains now anchors the island’s collective memory—a symbol of youth fractured by occupation, yet resilient in shared mourning. His legacy lingers in the quiet reconciliation between Shikotan’s Japanese past and Soviet scars, a testament to wars that steal homes but cannot erase the bonds forged under starlit skies.