In Radical Dreamers: Nusumenai Hōseki, Riddel's Room is a room in Viper Manor. As the name suggests, this room belongs to Riddel, daughter of General Viper.Small trinkets comfortably decorate the many shelves. A large plush bed sits across the room. A cup of warm tea and a handwritten letter reveal that this room belongs to a woman. The walls are green. To the player, the room's contents are viewed through an oval mirror with an ornate frame.