Memories of an Older Brother and Younger Sister

Satoru finds out that Hideyuki has his own family, much to the dissatisfaction of Tojo himself. Takeshi attempts to find Satoru by asking Shuichi, and later Shinji. Shuichi finds Room 401, the room where Shiro Kanzaki worked. Having learned the secrets about the Mirror World, Satoru attempts to kill Reiko. Mitsuru Sano reveals himself to everyone as Kamen Rider Imperer, offering his services as an ally for cash.