S&M Series

Since her teenage years, Shiki Magata has been a genius programmer. After she was arrested for the murder of her parents, she was diagnosed with multiple personality disorder and acquitted of all charges. Since then, Shiki has been confined to her room at the Magata Research Institute on an isolated island in the middle of the ocean. She has never once left the room in the fifteen years since.

Because Moe Nishinosono—a freshman at N University—had a personal connection with Shiki, Souhei Saikawa—Associate Professor and Moe's mentor—is about to go on a seminar trip to the campground on the island where the Magata Research Institute is located. When Saikawa visits the facility at night at Moe's invitation, they encounter a nightmare series of murders.

For some reason, communication with the outside world has been cut off. Saikawa and Moe proceed with their own investigation and find a mysterious message: "Everything turns to F." It has been left on Doctor Shiki Magata's computer, where most of the data has been erased. Intuiting that these words may be the key to solving the mystery, Saikawa follows his train of thought and closes in on the truth.

(Source: The BBB, edited)