On a larger-than-splashing morning, Yamamoto, a female high school student, was hurriedly washing up by Jiali (Ito Wan Lihua), but someone left a similar "F" mark on the nameplate on her doorstep. She was ordered by her mother to erase the mark, and in addition, she had to take her father's car to take her brother to kindergarten, so she missed the appointment to go to school with her good friend Naibo Matsuhara. Unexpectedly, Naibao's bus was involved in a serious car accident, and his friend was killed in a tragic accident. After that, Kerry was perplexed by mysterious symbols, and the figure of a deceased friend appeared in front of her from time to time, which almost broke her mind. Strange and strange events are becoming more and more intense, the Yamamoto family, which has already been shrouded in darkness, is on the verge of being broken, and the secret in Kerini's heart will also emerge quietly. This film is based on the short novel "F" by horror writer Koji Suzuki.