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A young high school student, Chiko, finds a mobile phone on a bench at the station. She receives mysterious calls announcing suicides that occur shortly afterwards. In order to prevent individuals from taking their own lives, she will run through Tokyo all night, with Bando, a brilliant student in her class. Will these two young girls with very different temperaments be able to stop this nightmare? An endless suspense that takes place in the different renowned districts of the Japanese capital!