Two security guards are patrolling the Beika Art Museum during knight. One of the security guards hears a voice which they start to patrol it. The two are going to a room which one of the guards hear the voice. They then are seeing a armored knight walking close to them which they are running away. The next day, Ran tells what she has heard around the neighborhood what have happened last night during the Beika Art Museum. Ran suggests that they should go to the art museum and to see armor that moves by itself. Conan and Kogorō starts to laugh at her which Kogorō says that she still has ways to grow up if she keep believing those kinds of stories. Conan and Kogorō then wanted to start at their homework, or work. Ran succeeded to bring Conan and Kogorō to the art museum which has been known by both two that they were been forced to go with her to the museum. After looking around the museum, Ran sees that the sign of the last room isn't been placed there anymore and asks Conan and Kogorō to take a look in the last room. Originally they don't want to because they are hungry, but Ran says that they can go home early, but they have to cook for themselves which they are again forced to walk with her to the last room. They then have entered a room named "Hell Room" which they are wondering what that place is because it is very dark. They are then seeing a huge picture about a knight that defeated a demon. Ran turns and sees the new owner of the museum that has been killed.