Qingtingguan Murder Case

Several college students came to a villa to attend a dinner of writers. While the dinner was in progress, a scream suddenly came through. When people rushed to the room, they found that the person in the room had been strangled to death. It seemed that he had just died. However, there was no exit from the room except the door, and the murderer disappeared. . . . . There is a copy of "Night on the Galaxy Railroad" by Kenji Miyazawa in the room. . . . . .