The timid, young Asuka is bullied by her classmates. When they embark on a class field trip to Korea, Asuka plans revenge by sending them a cursed phone message they can either pass on or die.

A Japanese restaurant cook/owner dies after answering his daughter's cellphone. Other people are getting strange, same ringtone calls as well and dying painfully. It happened in Taiwan as well. Can the police stop it if it's a ghost?