Ayane, a young woman thrust into a labyrinthine investigation after her brother Shingo dies under enigmatic circumstances, narrowly evades an assault by two men in an alley before being rescued by Takayasu Higashino, a private detective whose striking resemblance to her deceased brother unnerves her. Compelled by this eerie similarity, she enlists him to pose as Shingo, aiming to unravel the truth behind the fatal car accident she suspects her own family orchestrated.

Her resolve centers on Shingo’s unresolved death, driving her to collaborate intimately with Takayasu as their professional alliance blurs into physical and emotional entanglement. Utilizing his martial prowess, interrogative tactics, and talent for subterfuge, they probe hidden family secrets, with Ayane actively maneuvering to expose deceit within her kin.

The narrative anchors itself in her relentless pursuit of closure, sidestepping her past or familial ties beyond the core conflict. Her journey traces a deepening dependence on Takayasu, intertwining calculated strategy with vulnerable reliance as they navigate a web of suspicion and intimacy.