Haru Kato, a detective in Tokyo’s Modern Crime Prevention Task Force, carries the weight of a career-defining mistake: a bank siege where he fatally misidentified a civilian’s toy gun as a lethal threat. Demoted from his promising position in the First Investigation Division, his guilt manifests as an aversion to firearms and a relentless drive for ethically grounded investigations. Partnered with Daisuke Kambe, whose tech-centric methods and financial leverage contrast sharply with Haru’s humanistic approach, their collaboration evolves from friction to a nuanced alliance as they expose systemic corruption.

Guided by veteran detective Chosuke Nakamoto—a mentor whose untimely death during a probe into the Kambe dynasty galvanizes Haru’s defiance of bureaucratic constraints—he increasingly challenges institutional complicity. Personal layers reveal a frugal lifestyle honed through self-taught culinary skills and an unconscious bias toward those with unassuming appearances, reflecting unresolved idealism.

Reassigned due to professional disgrace and personal remorse, Haru’s resolve to protect civilians remains unshaken, balancing moral rigidity with tactical ingenuity. His pragmatic decisions in crisis, such as weaponizing a suspect’s vulnerability, underscore a duality of principle and adaptability. The shadows of past failures and Nakamoto’s legacy fuel his unyielding, if conflicted, pursuit of justice.