Hide & Seek.Nine and Twelve place bomb on a passenger train, and when they return, Lisa presents a meal to them, but it is burnt and inedible. Twelve later comments to Nine that it reminded him of the food at the institution. Nine and Twelve post another video with riddle, saying that an explosion will occur unless it solved before the deadline. Using clues from the riddle, Shibazaki concludes the newest bomb is onboard a train on the Shuto Shinjuku Line. He describes a connection between all of the bombings: the locations are linked to people connected a seminar run by the Rising Peace Academy, a secretive non-profit organization. When there are no reports of the bomb being recovered, Nine and Twelve attempt to deactivate the bomb, but cellphone reception fails throughout the area. Nine rushes to the station to remove it manually, throwing a smoke bomb into the carriage to force commuters off the train. However, one woman remains and as he enters the train to save her, the bomb explodes. As Nine drags the commuter out of the wreckage, he receives a text message saying, "I found you". Shibazaki confronts Kurahashi about the bombing, but he informs him that he had no knowledge of it. They then spot a mysterious woman sitting nearby, whom Nine identifies as Five.