Subete ga F ni Naru  

The Perfect Insider, すべてがFになる, すべてがFになる -THE PERFECT INSIDER-

Professor Saikawa and Moe Nishinosono arrive at an island with a laboratory belonging to Professor Magata Shiki. They are intrigued by the murder of his parents and manage to gain entry into his lab. Suddenly, a corpse dressed in Magatas clothing is ejected from his quarters, indicating that he was murdered. It seems that this will not be the only victim...

Subete ga F ni Naru is based on the Hiroshi Moris 1996 mystery novel of the same title, which is the first book in his S&M series.