On a late autumn day dramaturge Yarinaka Akisaya, his 7 actors and his friend, the novelist Rindou Ryouichi, have to take shelter from a snow storm in a western mansion that suddenly appears from the depth of mist that ascends from a lake. They don't seem to be welcomed by the inhabitants but each get their own room designated. Even so they are continuously reminded by the servants that Kirigoe Mansion is not a hotel and that they shall not sneak about too much, especially they shall not enter the 3rd floor at all...
In this ominous mansion strange coincidences happen and the building itself is said to be a mirror that reflects the future of those who visit it. Little would the guests be able to guess how these occurences lead to a chain of murders after the mansion and its surrounding are totally covered by snow without any way to inform the outer world...
