Well, as the (only!) other reviewer sort of implied, the story here is very straightforward. But it's the characterisation that is the problem. The "heroine" (using that word in the loosest possible context) is a problem.
Is she meant to be a "funny nerd", a la Jim Carey or perhaps Rick Moranis, at whom we laugh hilariously when she falls over her own feet? If so, then the movie fails, because she's not funny in that way - it would be like laughing at a paraplegic who fell out of a wheelchair.
Is she meant to be "seriously" clumsy, and so worthy of our sympathy? If so, then the movie fails also, because the clumsiness is so contrived, so exaggerated, the things that happen to her are so improbable, that the plot simply loses all credibility. It's like a "bad" war movie where the bad guys fire machine guns at John Wayne and every bullet misses, but he closes his eyes and with 6 shots of his revolver kills 20 baddies. And the scene where she "meets" her dead sister in the bathroom - well, that was totally incomprehensible.
Maybe this a "race" issue, with me not being Japanese therefore not being able to understand a Japanese "character" movie. I dunno. But by the end of the movie, I found myself regretting that I had allowed two hours of my life to slip away in front of the tube.
