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