Synopsis

The story begins when Sakaki Yura, a lonely high school girl who has shut herself off from others after a traumatic incident, is assigned to clean a restricted old school building with her classmates.
 
There, the group discovers a battered old smartphone. After Yura and her classmates watch a disturbing video that suddenly begins playing on the device, they start receiving ominous “death notifications” from the cursed smartphone.
 
As the classmates who receive the notifications are murdered one after another, Yura uncovers the hidden truth behind the mysterious phone.
But the shocking revelation is only the beginning of an even greater nightmare.