Story:
The concept of survival a la 127 hours, Buried Alive, etc is nothing new but this movie manages to stay fresh with the incorporation of social media element as well as doing away with some cliches. The pace is good too as within the first 5 mins, the protagonist Shunsuke is already down the manhole and so many things happen that it doesn't feel draggy. It is written in a way that makes you feel uncomfortable but full of anticipation at what is going to happen next as Shunsuke tries to get himself out. It's not too gory but there are parts that makes you want to turn your eyes away or wince in your seat. There is a nice twist that you do not see happening even if you read other reviews of this movie and consider yourself somewhat spoiled.

Acting/Cast:
Yuto Nakajima carries the movie as he fills the screen 90% of the time and he absolutely delivers. You can see his transformation from being the victim just trying to get out in time for his wedding, to feeling despair, and even unhinged. It is not an easy task to carry a movie alone while confined to the tiny space that is a manhole but he delivers. The ludicrous twist at the end works mainly because of his solid portrayal. Nao doesnt physically appear in the movie but has a large presence herself as the ex gf willing to help track Shunsuke. She did great for a voice acting appearance.

Overall: 9/10 . Solid acting performance, good storyline and pacing, that twist at the end.