From this point onwards, there will be a lot of spoilers so please skip this review if you haven't watched the movie.
As for the acting, I thought Inoue Mao really nailed it as Shirono Miki this time. I've not watched much of Inoue ever since her Hana Yori Dango days so much of my impression of her still comes from then when she was the spunky Tsukushi. However, she managed to blend herself into Shirono this time and was very convincing as the plain Jane who was wronged for something she did not do. As the movie needed to show both sides of the argument i.e. one of her being the suspected killer and the other being innocent, it needed her to show versatility in her acting and put on entirely different expressions to portray these two types of personalities. I thought she managed to do both sides pretty well which should have convinced some viewers at one point or another that she might have been Noriko's killer.
On the other hand, Ayano Go was surprisingly suitable as Akahoshi who was a jerk for most, if not all times. My impression of Ayano was largely formed when he appeared in "Saikou no Rikon" as a womanising-type of guy with a lazy charm so it surprised me to see him fitting Akahoshi to a T. I felt rather disgusted at Akahoshi, not just because of what he did i.e. not verifying the facts before airing his feature or tweeting his own speculations without proof but also his physical appearance which was kind of sloppy. Even though he got his just desserts in the end (sacked from his job and being attacked by netizens online for spreading the wrong information), I thought that the best punishment for Akahoshi was exactly how the movie ended because he would have to remember the consequences of his actions for as long as he lived.
As for Nanao who was making her film debut through this movie, I thought that the role of Noriko seemed to be a replica of what she did in "Last Cinderella". Equally annoying but I thought Noriko was far more detestable, not that she deserved to die in this fashion. She could probably have been punished in another way for the things she did. Due to the fact that Nanao is still pretty new at acting, there were times when I thought she was a bit stiff but she did manage to convey the spitefulness of Noriko to a certain extent, which I thought was commendable for a first try. If you've seen what she is doing in the current season drama "First Class", I think she seems to be getting better at playing nasty and detestable women which may be good or bad for her career. She has to be careful of being stereotyped if she plays too many of such roles.
Story: 9 out of 10 (A bit anti-climatic on the revelation of the killer's identity, would have been better if the suspense factor was improved on)
Acting: 8.5 out of 10 (Inoue Mao and Ayano Go both managed to change my impressions of them and showed versatility in their acting. Supporting cast was OK too.)
Theme song/BGM: 5 out of 10 (The Serizawa Brothers' music didn't leave too much of an impact on me.)
Visual effects / Scenery: 6 out 10 (There were a variety of indoor and outdoor scenes but nothing in particular outdoors which really caught my eye.)
Teamwork / Chemistry: 6 out of 10 (Surprisingly, being the leads of this movie, Inoue and Ayano only had one scene together at the end of the movie so it's hard to say if they had any chemistry. What's more, Inoue and Nanao were mostly featured in flashback scenes so their interaction with the rest of the cast was somewhat limited)
Total: 34.5 out of 50