Kyōsuke Takamizawa emerges as a private investigator drawn into the turbulent life of Kimura Yui, a young woman ensnared in a web of violence following her counselor Kanzaki’s murder. Their paths collide during a rain-soaked night in Tokyo, where he discovers Yui shaken and disoriented, fleeing the trauma of discovering the crime scene. Takamizawa provides refuge and allies with her to unravel the truth behind the killings, circumventing official channels as Yui distrusts the police, who view her as a potential suspect.

His approach blends careful analysis of crime details with attentive listening to Yui’s fragmented recollections, navigating the investigation outside law enforcement’s reach. Their partnership evolves under mounting tension, marked by Oki, a tenacious officer whose scrutiny threatens to disrupt their efforts. While Takamizawa steers Yui through the labyrinthine mystery, details about his personal history or motivations remain undisclosed. The narrative halts abruptly, leaving his ultimate role and backstory open-ended amid the unresolved stakes of their collaboration.