That's a basic summary of the plot. Our main character, Sakamoto, isn't your typical manga protagonist who is born to fight, able to battle and kill with no qualms. He is a man with a conscience and even in the kill-or-be-killed environment of the tropical island, he still finds it difficult to just kill others and in the few cases in which he does so he is filled with regret (and even in these situations he only did it because he had no other option). He is, in my opinion, an interesting protagonist and a refreshing break from some of the other protagonists in manga who seem to be slightly unrealistic in their approach to situations.
I'm not going to write too much about the story because as of the time of writing it simply chronicles Sakamoto's attempt to survive and escape the island. That's not to say it's bad though; indeed, so far the action has been intense and satisfying.The art is also quite good, but nothing exceptional. However, it is nice to look at and it certainly manages to capture the feel of the story in it.
Overall, it's an enjoyable manga that I recommend you to read. If you enjoyed Battle Royale or seinen works like Gantz, I recommend you check this series out.
