A quiet woman receives a social media request from a middle-school friend, who she doesn’t remember fondly. The two meet at a hotel’s restaurant where they find a room numbered 666 containing Rokuroku, a long-neck woman wearing a red kimono.

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.