This is an interesting manga to say the least. When you have a zombie story, rarely does it take place in the middle of the ocean on the boat. Take with that the fact that it is on an upside down ship. Very original overall. The characters have very deep personalities that only adds to the mystery and goodness of the story.

The one thing i did notice however, was that the manga is bases alot off of the movie "Poseidon". At several times the manga matches the movie scene for scene, like when they are crossing an elevator shaft.

So to summarize, its "Poseidon" meets "Dawn of the Dead", and it works very well!