Satoshi Oosugi, a final-year university student and member of the Eden of the East group, balances academic life with collaborative ventures in image recognition technology and recycling operations. During Saki Morimi’s graduation trip to New York, his path intertwines with Akira Takizawa, thrusting him into a dangerous game to redefine Japan’s future. Oosugi’s unspoken affection for Saki fuels simmering jealousy toward Takizawa, whom he views as both a rival and an obstacle to her attention. Within Eden, he aids efforts to expose the truth behind the Careless Monday attacks and the shadowy Seleção conspiracy. Often cast as a hapless figure, Oosugi endures comedic missteps—abandoned meetups, ill-timed drunkenness, or accidental targeting by enemies—yet persists in supporting the group through logistical coordination and operational groundwork. His loyalty remains unwavering despite recurring misfortunes. After resolving the missile crisis, Oosugi stays with Eden as it transitions into a thriving enterprise. Six months later, in *The King of Eden*, he assists Saki’s quest to locate the missing Takizawa while grappling with his unresolved emotions amid her deepening bond with the amnesiac fugitive. The narrative prioritizes his role in group cohesion and his quiet yearning for Saki over personal history, leaving his family or early life unexplored. His arc persists as a steadfast yet emotionally tangled ally within Eden’s evolving mission.