Kakeru Ōtori is Naru Ōtori's older brother, navigating two distinct worlds. At Alexander bar, he moves as a charismatic ladies' man alongside Shūsuke Chitose, known to friends as "Eagle." By contrast, within the city's underworld, he commands the Yanagihara Flame Birds gang under the alias "Phoenix," revealing a far more aggressive and violent nature.

His past intertwines significantly with Hayato Narita, whom he calls "Falcon" from their shared history, marked by moments of cooperation despite their divergent paths. Kakeru fiercely protects his sister Naru, readily intervening in situations involving her, such as her encounters with Hayato during her bicycle search.

A psychological complexity defines him: his Eagle and Phoenix personas initially remain context-specific but gradually bleed together as the narrative unfolds, suggesting underlying instability. He sometimes attends covert meetings with Hayato and Shūsuke within a symbolic church setting, indicating an awareness of their interconnected lives.

Physically, Kakeru possesses black hair, red eyes, and a tall, lean frame. His attire shifts between refined social wear and rougher gang clothing suited for nighttime activities. His personality fluctuates dramatically between flamboyant charm and intense volatility, capable of dramatic expressions and occasional cruelty, especially when leading his gang.