Doji Aiko was the wife of Doji Yujiro. She was a beautiful and energetic woman who would flirt casually with any handome men. She would always be careful never to say anything that could not be laughed away as a joke. She was bored by her husband, and began an affair with Mirumoto Rai a year before the Tournament of the Samurai.  She was in her chambers with Rai at the time of Asako Shizu's murder, but Rai was unwilling to comprimise her integrity by using her as an alibi.