The police chief announces to a meeting of his task force that a unit of the American Federal Bureau of Investigation (FBI) will join the investigation, surprising the other officers. Nine has a nightmare involving Five, and he and Twelve conclude that Five is continuing a game of chess the three played years ago. Lisa offers to help them, and Nine reluctantly agrees. Kurahashi tells Shibazaki about his meeting with the FBI agents, which included Five, described as a researcher from an American organization called the Nuclear Energy Support Team (NEST). Posing as Sphinx, Five sends a public text message containing a riddle which can only be decoded via Caesar cipher. The answer is a set of coordinates leading to Haneda Airport's International Terminal. The police are told to stand by on orders from the superintendent general, but Shibazaki and some others ignore the order and head towards the terminal. Knowing that a trap is being set by Five, Nine takes Lisa to the terminal with Twelve in an attempt to avoid detection. Twelve realizes that Five is using the terminal building as a chessboard.