There are legends that there is a second race on earth besides humans: cartoons. One can only hear about their past, present, and future from legends. However, a young boy named Frisk wants to find out the real truth about this race and goes on a search. The child finds a dusty book in the library, but does not know whether he can trust it, because even in the book itself one can find contradictions, not to mention the fact that its story is completely different from the one he heard.