To be frank, the movie was a lot of fun and I quite enjoyed it. However several aspects were so terrible that it warranted a review on my part.
The three actresses were extremely annoying and their behaviour was childish to say the least. They were squealing and shrieking like 5 year old girls at the smallest excuse. Nobody screams that much and their acting was lousy.
What also struck me as unrealistic was the fact that the company was forcing them to risk their lives and go into a haunted house, even when they were extremely uncomfortable with the idea. And the actresses themselves were totally cool with it. I don't know if this is common in Japan or an incongruity in the script. But in a free world, forcing a trio of young women into extreme danger against their will is a criminal offense. However this fact was glossed over.
Even when one of the women wanted to quit, the other two were behaving as if they couldn't believe that somebody can just refuse to be part of such a dangerous business. They kept repeating "It's your job, you have to do it, you can't just quit". And later her boss scolds her for stepping out.
The black tendrils were very laughable, flat and unrealistic. They screamed fake, computer graphics. That and the incessant screaming ruined the illusion of the movie for me. The director could have easily used some practical effects and it would have been much more realistic.
Now the good part. The acting of the exorcist and his master was excellent. The Neo character too was fairly good. The small possessed girl was sufficiently creepy. The plot and pacing kept me engaged and entertained. I didn't care for the ending as it was a bit abrupt and left the viewer hanging.
Overall, worth a one-time watch.