Based on two novels by Miyuki Miyabe: "Dare ka Somebody" (published November 13, 2003 by Jitsugyo no Nihon Sha) and "Na mo Naki Doku" (published August, 2006 by Gentosha Inc.). Ep.1-5 in the drama series is based on "Dare ka Somebody" and ep.6-11 is based on "Na mo Naki Doku".