Lambdadelta takes over as game master following Beatrice's defeat, and Bernkastel takes primary control of the human side — introducing Erika Furudo, a detective with a strict mystery-genre approach to the island murders that directly conflicts with Battler's anti-fantasy stance. Running alongside this confrontation is the story of Natsuhi, who begins receiving threatening calls from a man identifying himself as the Man from 19 Years Ago.