One thing that entertains me is the mysteries of this film; why is the mailman checked by means of the test on his tongue and what does the box contain? The mystery which remains a mystery made me think about this and that. The story unfolds leaving me behind, and it produces a kind of tension. Coupled with white snow backgrounds in which one won't see something living, the tension continues getting higher, and it glued my eyes to the screen. Other entertaining elements which take me to the other world is, for example, the combination of the present-day houses and the future-like technology seen in some places and scenes. The gap between them brings about unreality, and it seems to increase the mysteries. Although the gap is an effective element, it also seems unnatural; especially, the robot may look too high-technological. It is possible that the unnaturalness leads to funniness and breaks the serious mood on this film. However, I'm sure that the film is one which I can't take my eyes off of.