Kōji Suzuki

One day, a mysterious letter 'F' starts to be written on doorplates in a condominium building. Since then, mysterious incidents consistently occur around Yukari Yamamoto, who is an ordinary female high school student living in the building.

Akane is a high school teacher who hears a rumor from her students that there is actual footage on the Internet of someone's suicide. The footage is said to drive anyone who sees it to also commit suicide. Akane does not believe the rumor at first, but when one of her female students dies after viewing the footage, she and her boyfriend Takanori are fatefully drawn into the horror that has been created by the man who appears in the suicide footage, Kashiwada. Kashiwada's intention is to create chaos in the world by bringing back Sadako and the power of her curse. Now Akane has to fight against Sadako and Kashiwada to save the lives of herself and Takanori.

Transfer student Kana is assigned a seat whose previous occupants committed suicide.

A high school teacher, Masato Saito, is told by his best friend, police officer Shinya Saito, about a strange murder case. The incident was that a woman broke through her belly and had an umbilical cord popping out of her belly, and at the same time three men were said to have blew bubbles from their mouths and died. One day, Shinya's wife, Junko, receives something called Baby Mail. The baby mail says, "I have a grudge against someone who is trying to have a child. I will raise my child." When she opens the attached file "@", the baby cried and the LCD of her cell phone cracked, which was creepy. A month later, she was found in a condition similar to the bizarre incident. However, she was diagnosed as four months pregnant when her body was found, even though she had her period a month ago.