Well... I saw that many people have different views of this movie. Just like the other American Paranormal Activity movies, this one has its pros and cons.

In some aspects it's a little better than the American Version, but in other aspects it's not as good.

When it comes to scary, it delivers pretty much the same amount of frights (and if not somewhat better). When it comes to the story, it drives off from the original story into a new one that doesn't seem so creative. There were some surprising new elements into this installment, some that were good and some that were not as much. The ending was a bit weird, but I thought that was better than the original American ending. I just wish that the script wasn't so rushed.

In short, some aspects are better and some aren't (I wouldn't say worst), yet it's a fine entry to the Paranormal Activity saga, I just think it was a bit unnecessary to do this semi-sequel/semi-remake. But some people differ from this opinion saying it's better than the American Version and some prefer the American one. But this is just my point of view, I think I'll stick to the American version, though I wouldn't mind seeing another Japanese installment.