Emily KUSAMA (Meisa KUROKI), an 11th grader at Anjo High School, is going on a class trip to Korea. She's looking forward to seeing her friends, including a Korean guy named An JINU (JANG Gun-Suk), whom she befriended through her involvement with the Japan-Korean Sign Language Association. On the other hand, she's sad that her childhood buddy, Asuka MATSUDA (Maki HORIKITA) has opted not to go with them to Korea, because she's being bullied by her classmates. While on the trip, one of the students receives a photo message that arrives with a strangely familiar ringtone. The message is date-stamped in the future. The accompanying picture shows the student's own death... by strangulation. Sure enough, that student dies at the exact time stamped on the photo message. One by one, the students are haunted by spooky photo messages that predict their deaths. Then, just as predicted, they each meet a deadly fate. Why is this happening? Who _ or what _ is responsible? Suspicion runs rampant within the group. Infighting and betrayals rage among the students. Emily, however, stays out of the fight and focuses on her own hunch. Emily's suspicious are proven correct when she discovers that the messages are coming from Japan... from her bullied friend, Asuka. It appears that there's only one way to avoid the death that accompanies the lethal photo message and its sinister ringtone: forward it along to someone else before you die.