Enma and the Lost Castle (Japanese: エンマと失われた城,Enma to Ushinawareta Shiro) is the 44th episode of the Yo-kai Watch Shadowside anime. It will be broadcasted in Japan on February 22, 2019.
The Yo-kai Detective Team hears from Kaira, that if the Soranaki Virus was to obtain power, the human world and the Yo-kai World would be engulfed in great confusion, and the worlds would ultimately be destroyed. He also says that if Natsume, who possesses the power of Shuka, were to truly awaken, she might be able to defeat Soranaki, which concerns Natsume. Meanwhile in the Yo-kai World, the Great King Enma and Nurarihyon reach the castle of Shuka, the destination of their journey.