It begins with the titular "Knife-Edge Girl", a story about two friends with completely different approaches to life.

Also includes "Graffiti," in which two women who use the same desk at different times of the day communicate by drawing messages on the desk top. Kana begins to happily anticipate exchanging these message and finds herself wishing to know who this stranger is who shares her desk.

In "Torte Fromage" Miwa's boring OL life is suddenly thrown into a world of glamour and excitement when she meets the beautiful avant garde actress Nagae-san.