Satoru, a wheelchair-bound elementary student, locks himself away from the outside world after his mother dies. His father designs a remote-controlled robot to go to school for him, allowing him to interact with people and do normal things.

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.