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This is the Kagerou Daze link you went to isn't it? Well this is indeed the novel version. As with ShieldBro the Manga version on Amazon states so in the title.
The link took me to http://www.amazon.ca/Kagerou-Daze-Vol-1/dp/0316259470/?tag=geo01-20, i'm not sure if the beta comments are mixing it up at the bottom though.