 Characters from One have appeared in other media not directly based on the One series . The six heroines from One have appeared in the Eternal Fighter Zero dōjin games by Twilight Frontier . Additionally , Rumi Nanase can be seen as a background character in several episodes of the Kanon anime series by Kyoto Animation . Itaru Hinoue , the art director of One , included illustrations from One in her art book White Clover : Itaru Hinoue Art Works released in 2009 . 
