 In the novel and manga versions of Battle Royale Shogo carries a bird call Keiko had given him, and uses it as a signal should any of the main group get lost or, in the case of Sugimura, succeed in finding Kayoko let them know he found her.This is later exploited by Kazuo Kiriyama after Sugimura and Kayoko are killed.Shogo also carries a photo of him and Keiko in all versions.