Shinji serves as a supporting character in a narrative following Japanese youth enrolled in the early 20th century Manchurian Youth Colonization Program. He volunteers alongside peers for this government initiative, driven by nationalistic ideals and the promise of advancing Japan's colonial ambitions through agricultural settlement in Manchuria.

As part of the deployed group, Shinji endures collective hardships: adapting to unfamiliar terrain, confronting severe weather, facing food scarcity, and enduring psychological strain from isolation. These struggles unfold against the backdrop of Japan's colonial administration and rising local resistance. His daily existence is shaped by interactions within the group and with their instructor, though specific personal relationships beyond the collective dynamic remain unexplored.

Historical events, including the outbreak of World War II, see Shinji sharing in the group's escalating struggles. The narrative positions him within themes of resilience, camaraderie, and the moral ambiguities of colonization. His individual story arc, personal development, and specific outcomes remain undefined beyond the collective experience depicted in the film. No additional background, development, or appearances in other media are documented.