Akiko Masumoto (松本 秋子 Masumoto Akiko?) is a female ninja, a dead-ringer of Tetsuzan's late wife, sent by Feast Ninja Gyuma's successor to spy on the Yamaji family. However, Akiko betrays the second Gyuma after befriending the Yamaji family, particularly Manabu. Goodbye! Illusion Mother-sama