It was a amazing drama, which was full of surprises. Do not get mislead by the plot holes from the first episodes. At first, I could not understand why the second main lead character (Yuno) was in love with the first main lead character (Arata). It felt like a big mistake by the writers to make Yuno fell in love with Arata with out a reason. However, it will make sense in the next episodes. You just have to keep watching. There are a lot of shocking moments in the series. Every episode is better than the last one.
On the other hand, I do not believe it was a show that could make you touched by the emotional scenes. There are some dramatic moments in the series but they were not enough to make me feel too sorry for the characters for some reason. Do not get the wrong idea from my words. I think the acting in this drama was very good. Especially the mimics of the main lead character Arata acted by Masaki Okada and Yuna acted by Ayame Gôriki were very impressive. However, for some reason it was hard to get emotional. Maybe it was due to the fact that there were not enough episodes to get attached to the characters in the series or maybe there were too much action for a TV series with only 11 episodes. It was hard to focus on the characters in that short amount of time. Therefore, it was hard to feel nervous for a character even when they were getting in danger. I just kept watching the episodes without a worry for characters. In fact, it was very enjoyable to watch the story rather than the acting of actors. It is rare to see a story shine brighter than the actors in these area of TV series. I wish there could be a second season or more episodes to give the writers more freedom to focus on the characters. Also, when the TV series finished I wanted to see more of this series with the same actors. I am not saying that the ending was not good enough. I am just saying that after the series finished I kept wanted to see more of it. 11 episodes just felt too short. Especially for a action drama. I was just getting use to the characters and it finished.
I think this TV series deserves lot more attention. Do not fooled by the low rating. As a person who has watched countless TV Series, I can say that it was one of the best Japanese action dramas I have ever watched.