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I think he would have been able to throw doubt towards her but it seems that for one he kept his power secret and two he was a loner scumbag with no friends and Nana was a popular kind and cute girl who just became the elected leader of the class. Heck, it might have even gone so far that some might have believed him but others would have believed that he is an agent of the enemy of humanity who tries to slander and frame their new leader after killing their previous one.
And third and most important point: The guy believes his picture to be absolute. Meaning he knew that he will end there in that sport storage room no matter what he does. Telling everyone else in hopes of them believing him and taking Nana into custody before the picture comes true? No snowball chance in hell, that was his deep conviction. So why waste time trying to escape a fated situation when he knows that someday he's going to end there anyway?
That was his plan for this situation as he knew he can't be killed by Nana as long as he doesn't enter that room, which we saw was kind of true as Nana couldn't just kill him in his room for example. So Nana had to made him enter the room by giving him a prophetic mean of survival which again worked to prove his prophetic pictures true in the end.
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