F (ef)

, is a Japanese light novel series written by Shinichi Sakairi, with illustrations by Nagiryo. The series began publication on September 10, 2005 by ASCII Media Works under their Dengeki Bunko publishing imprint.

Synopsis
Saya, a beautiful girl who respects death and is therefore at the other end of death. Yururi, a girl who is indifferent to death and is therefore close to death. Like a bug guided by a light trap, the surroundings of the two are full of absurdity. A person with a talent that is hard to die, who unnecessarily detours the path to death. Those who have the talent to fear death, on the contrary, raise the fear of everyday life and sprinkle death around. They are all sincere in their thoughts, yet distorted and somewhat sad. When the two meet "them", the whimsical gear of fate begins to squeak. This is distorted, unusual and crazy-a "F" rare story.