Shusuke Chitose balances part-time work at the Alexander restaurant and bar with freelance reporting and book reviewing, persistently battling financial instability. His initially contentious dynamic with coworker and aspiring novelist Hiyoko Tamaizumi evolves into a complex bond, marked by her tending to his injuries—moments laden with metaphorical weight. He shares a friendship with Kakeru Ohtori, who addresses him as Eagle.

Chitose exists as one of three alternate personalities within a single individual, alongside Takashi Haneda and Hayato Narita. Unlike Takashi, who remains unaware of the others, Chitose possesses full consciousness of both Hayato and Takashi. He periodically coordinates with Hayato to covertly support Takashi, aiding his psychological struggles without Takashi's knowledge. Injuries sustained by any personality identically manifest on all three bodies, providing subtle clues to their shared existence before the full revelation.

Pragmatic and grounded compared to his counterparts, Chitose navigates daily challenges like employment and interpersonal friction. His background includes a gradual shift from mutual dislike to genuine care for Hiyoko. Named after New Chitose Airport in Sapporo—consistent with other male leads tied to Japanese airports—his character arc involves managing financial precarity, evolving relationships at Alexander, and his distinct role within a system of dissociative identities that operates both independently and collaboratively.