It's absolutely serious and that's why it's so awesome. It starts explaining the virus, solanum and goes through the phases chonologically that the body would go through when infected.
then defense, how to properly kill and look out for yourself etc.
Also, there are small entries in the back for different time periods where their were possible apperances of zombies. Journal entries from Marco Polo etc. It kind of creeped me out when I went through and read all of them to be honest ^^; I'm such weanie.
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