Mnemosyne no Musume-tachi 2008

Before the release of the first anime episode, a light novel adaptation entitled Mnemosyne no Musumetachi 2008 started serialization in Hobby Japan's light novel magazine Charano! on January 30, 2008. The light novel is written by the scriptwriter of the anime, Hiroshi Ōnogi, and illustrated by Chūō Higashiguchi. (Wikipedia)