People who watch a cursed video suddenly die. These deaths occur across Japan. Ayaka Ichijo is an extremely intelligent student with an IQ of 200 who will have to unravel the mystery of the cursed video to save her little sister’s life which she watched for fun. Ring 4 follows Ayaka Ichijo (Fuka Koshiba), a student who is skeptical of the video and the legend surrounding it, which has become a viral sensation. She soon discovers that her sister Futaba (Yuki Yagi) has seen a copy of the tape and discovers that her death will not occur in seven days, but in 24 hours, prompting her to unravel Sadako’s curse to save her.