Kanta Seno, younger brother to Junpei, resides on Shikotan Island with their father Tatsuo, grandfather Genzō, and family servant Mitchan. His name, drawn from Campanella in Kenji Miyazawa’s *Night on the Galactic Railroad*, honors a story beloved by their late mother—a tale the brothers often reenact through whimsical games.

Bursting with playful energy, Kanta revels in mischief, challenging Junpei to seabird egg races or disrupting Genzō’s fishing with impish glee. Though his vivacity contrasts Junpei’s solemnity, their bond thrives in shared imaginings of celestial trains and starlit adventures from their mother’s cherished novel.

When Soviet forces occupy Shikotan, Kanta’s world fractures as soldiers seize their home. Undeterred by language barriers, he cautiously befriends Tanya, daughter of the Soviet commander, bridging divides through tentative laughter and exchanged curiosities.

Forced into relocation, Kanta’s resilience wanes during a harrowing trek to reunite with Tatsuo in an internment camp. His strength ebbs with each step, until, beneath Junpei’s hushed recitation of *Galactic Railroad*—a diversion to shield him from watchful guards—he slips away silently. Junpei immortalizes his brother through private rituals: envisioning Kanta boarding the spectral train, forever journeying among the stars.

Years later, Kanta’s weathered grave anchors Junpei’s pilgrimage to Shikotan, a silent testament to a life extinguished too soon, yet enduring in memory amid the echoes of war and loss.