Jin leads a group of street children inhabiting Asylum Stadium, an abandoned structure serving as a refuge for the homeless within a future setting of civilizational decline. Orphaned by a devastating war, his experiences fuel a deep distrust of authority and systems. Jin possesses cybernetic enhancements granting significant physical strength, which he uses to protect his community from external threats.

He organizes resistance against police attempts to demolish Asylum Stadium as part of a city beautification project. To counter the eviction and demonstrate the community's cultural value, Jin conceives the idea of hosting a street-art festival titled "The Asylum Session." His worldview remains cynical and disillusioned with societal structures.

His relationship with Hiyoko, a runaway art student who joins Asylum Stadium, becomes significant. Recognizing her artistic potential, Jin assigns her to create a large-scale mural for the festival. Through their interactions, he reveals aspects of his past and philosophy, including his belief in art as a tool for resistance and self-expression. Jin exhibits a protective nature toward the stadium residents, viewing them as an adopted family.

Jin's development shows a gradual shift from isolation toward collaboration, evident when he entrusts Hiyoko with a central role in the resistance effort. His leadership style blends strategic planning with a readiness for direct confrontation when necessary. The physical capabilities derived from his cybernetic implants serve both practical defense and symbolically represent his hardened exterior contrasting with his dedication to preserving the community.