Rookie female detective Aya Murase chases after a notorious thief. Trapped with no escape, the two point guns at each other—when a bullet strikes their heads, they both lose consciousness. Though unharmed, something bizarre has occurred: their bodies have swapped. Now, Aya finds herself in the thief's body, free to move about, while the thief inhabits Aya's body and is locked in a detention center. When she tries to explain the truth to her senior detective, no one believes her, leaving her helpless. Will the thief continue escalating his crimes unchecked? And what will become of the real Aya? The story takes a dramatic turn from here.