Good premise, tho I've seen this plot in other movies, can't name them cause I'd spoil too much, so I'll try to explain why I disliked it without giving the idea away.
If you're heavily into Asian horror movies, especially those with a Japan touch on them, it could just happen that you'll enjoy this. But as it moves forward it starts to look like a dream, where your feet are running yet you go nowhere, time starts to stand still and everything else catches you from behind. Slowly and surely it drags itself for too long, getting harder to watch, or just to keep you eyes opened to be honest.
It will happen that this movie actually ends at some point, but when you'll realize what this is all about, the idea outside the idea of the movie, the seed from where it all began, well, this is a split road right here. Either go full in or go back.
Cheers!
