 The novel contains a two short stories that is a sequel of Takako's scenario, and Kana and Yukari have little sisters.The revised and completed edition of the "dōjin" novel was published as an official novel by Enterbrain on December 25, 2007.Three volumes based on "Futari no Elder" were written by Tasuku Saiga and published by Paradigm between September 30, 2010 and January 19, 2011.