"Pop sensation Kou Shibasaki stars as Yumi Nakamura, a teenager who gets freaked out when her best friend, Yoko (Anna Nagata), gets a call on her cell phone – from herself, screaming, dated three days in the future. Three days later, at the exact time of the call – which had an ominous, strange ring tone – it all comes true, with Yoko screaming as she dies. The calls continue as Yumi's friends fear that they will be next to hear the ring tone that foretells death. Meanwhile, Yumi is joined by Hiroshi (Shin'ichi Tsutsumi), whose sister was recently killed and who wants to get to the bottom of the mystery before more young women die.