A young woman is discovered strangled to death at the boat pier in Tokyo. There are no signs of disturbed clothing and assault, and because the body was abandoned at a prominent spot, it shows that this was a premeditated crime by a criminal with the presence of mind. Joto Chuo Police Precinct’s detective Kunihiko Katsuragi rushed to the scene, and the fact that the body is barefoot weighs on his mind. The next morning he finds out the commander assigned this case is his son Toshifumi.