Detective Toshiro Niide is a straightforward man with a strong sense of justice. To arrest a criminal, he disregards danger and sometimes acts in ways that seem reckless. Whenever he is on the verge of being consumed by anger, he is guided by the words of his wife, Saori: "Show me kindness rather than anger. That is the right thing for you to do." Niide and six others whose loved ones have been taken each receive a mysterious message on their phones: ''You have been entered in the kiDnap GAME.''
