Subete ga F ni Naru

Subete ga F ni Naru (すべてがFになる, lit. Everything Becomes F and subtitled The Perfect Insider) is a Japanese 1996 mystery novel by Hiroshi Mori. It has been adapted into a manga, a visual novel, and a live action drama. An anime television series adaptation produced by A-1 Pictures premiered in Japan on October 8, 2015.