Why at the end of Vol.2 (showing what will happen in Vol.3) Yuusuke says: "Why did I think I was the only one able to walk among them?"
Anyone would say that this means that in Vol. 3 there was going to be another person "immune" to the zombies , that is, like Yuusuke, but in the end nothing happened.
Why? Why was Vol. 3 shorter than Vol. 1 and Vol. 2, considering they could have added so much more awesome content?...