In this post I'm going to cover some important points of the progression of the movie, that were not cut and dry.
There are a few different parts where the movie takes its sharp turn into believing that Asami is a mentally scarred torturer, some of which could be considered a dream sequence or a hallucination. As the movie progresses, it becomes clear that most of them could be viewed as a dream sequence- but the problem is, not all.
When Aoyama gets in bed with Asumi, it can be assumed they do what we'd expect them to do, and then falls asleep, which would allow him the chance to dream, which could encompass the entirety of Asami disappearing without a trace, meeting the old stepfather, going to the shut down restaurant and the surreal torture sequence, save for the brief moment where he 'wakes up' to be back in bed with Asumi and goes to the bathroom.
This is fine, and works with the exception of the foreshadowing clip of Asumi answering the phone call for the second(?) date, where the slave in a bag rolls across the floor and moans. This is before the dream sequence, and there is no reason for Aoyama to be hallucinating or dreaming at this point- he is just at work and decides to make a phone call on his way out. Also, he doesn't seem the least big perturbed by this vivid hallucination he has, as they go on a date anyway. The placement of this scene tells us the slave, and Asumi's vile intentions are all real.
From there, you have to assume that it is Asumi's disappearance, the crazy old man, the slave in a bag and the torture scene that are all real. The 'waking up' in bed with Asumi is a fantasy. This is supported also by Asumi's body language as she undresses- her movements are slow, and angered, and then she returns to her submissive facade as she faces Aoyama again.
At that point all of the happenings between when Aoyama gets drugged and hits the floor are hallucinations that just don't happen, mixed with the pieces that Asumi told Aoyama while they were going out on dates. For the most part, nothing that Aoyama experiences while falling down drugged is new to him, or couldn't be pieced together inside his head at that point. Also, Aoyama was drugged, so Asumi's little speech after her neck was mangled by her final fall could have been hallucinated as well.
"For the most part", however, doesn't include that Aoyama vividly hallucinates the slave in a bag while falling down from being drugged. If the slave in a bag exists, then he couldn't possibly hallucinate something he has no experience with to that sort of detail. In this description of the progress of events, there is no point where Aoyama is introduced to the slave in a bag, nor is there time for him to be.
That brings us to a binary choice about what to think of this movie: Either Aoyama was hallucinating vividly, without any precursor, of awful things about Asumi that he didn't believe while in no state to do so (which entails that Asumi really is just a tortured girl, not a sadistic torturess)... Or Aoyama vividly dreams something he doesn't know about, that actually does exist. This could be either a super lucky guess, or some mental link between Aoyama and Asumi, or maybe some good old voodoo. This would entail that Asumi actually is the evil torturess, really did cut off one of Aoyama's feet, and possibly died when she hit the floor after sailing over that flight of stairs.
If anyone can piece together the movie so it doesn't have either of these blatant holes in the plot, then I'd be happy to go onto a deeper discussion of the meat of the movie.
There are a few different parts where the movie takes its sharp turn into believing that Asami is a mentally scarred torturer, some of which could be considered a dream sequence or a hallucination. As the movie progresses, it becomes clear that most of them could be viewed as a dream sequence- but the problem is, not all.
When Aoyama gets in bed with Asumi, it can be assumed they do what we'd expect them to do, and then falls asleep, which would allow him the chance to dream, which could encompass the entirety of Asami disappearing without a trace, meeting the old stepfather, going to the shut down restaurant and the surreal torture sequence, save for the brief moment where he 'wakes up' to be back in bed with Asumi and goes to the bathroom.
This is fine, and works with the exception of the foreshadowing clip of Asumi answering the phone call for the second(?) date, where the slave in a bag rolls across the floor and moans. This is before the dream sequence, and there is no reason for Aoyama to be hallucinating or dreaming at this point- he is just at work and decides to make a phone call on his way out. Also, he doesn't seem the least big perturbed by this vivid hallucination he has, as they go on a date anyway. The placement of this scene tells us the slave, and Asumi's vile intentions are all real.
From there, you have to assume that it is Asumi's disappearance, the crazy old man, the slave in a bag and the torture scene that are all real. The 'waking up' in bed with Asumi is a fantasy. This is supported also by Asumi's body language as she undresses- her movements are slow, and angered, and then she returns to her submissive facade as she faces Aoyama again.
At that point all of the happenings between when Aoyama gets drugged and hits the floor are hallucinations that just don't happen, mixed with the pieces that Asumi told Aoyama while they were going out on dates. For the most part, nothing that Aoyama experiences while falling down drugged is new to him, or couldn't be pieced together inside his head at that point. Also, Aoyama was drugged, so Asumi's little speech after her neck was mangled by her final fall could have been hallucinated as well.
"For the most part", however, doesn't include that Aoyama vividly hallucinates the slave in a bag while falling down from being drugged. If the slave in a bag exists, then he couldn't possibly hallucinate something he has no experience with to that sort of detail. In this description of the progress of events, there is no point where Aoyama is introduced to the slave in a bag, nor is there time for him to be.
That brings us to a binary choice about what to think of this movie: Either Aoyama was hallucinating vividly, without any precursor, of awful things about Asumi that he didn't believe while in no state to do so (which entails that Asumi really is just a tortured girl, not a sadistic torturess)... Or Aoyama vividly dreams something he doesn't know about, that actually does exist. This could be either a super lucky guess, or some mental link between Aoyama and Asumi, or maybe some good old voodoo. This would entail that Asumi actually is the evil torturess, really did cut off one of Aoyama's feet, and possibly died when she hit the floor after sailing over that flight of stairs.
If anyone can piece together the movie so it doesn't have either of these blatant holes in the plot, then I'd be happy to go onto a deeper discussion of the meat of the movie.