A strange ringtone came from the mobile phone, and the caller was actually his own name. There was an unknown message on the other end, but it was undoubtedly his own voice. What was going on? "Ghost calls" quietly spread among college students. Once you receive a ghost call, you will inevitably die tragically within the time predicted by the phone. Yumi's (played by Shibasaki Kou) friends Yoko, Kenji, and Natsumi died tragically one after another. Yumi wanted to save her friends' lives, but she was helpless. Yamashita's (played by Shinichi Tsutsumi) sister also died on this phone call earlier. He tried to help Yumi to uncover the truth, but soon, Yumi also received a ghost call...