Every boy in his childhood wanted to be a hero. A hero who can save the world from any threat that a stormy and almost borderless childhood imagination can imagine. Someone wanted to save the world from hostile aliens who chose to enslave the Earth, someone from terrible monsters. Be that as it may, the brave heroes, having plenty of war, and, of course, having won, tired and contented went home. And the next day, few of them worried about the fate of the world, because someone from the neighboring guys managed to come up with a new, much more interesting game. Unlike other children dreaming of heroism only from time to time, Kenji Endo and his friends took this matter seriously. Their fantasies were unusual and ambitious. Therefore, it is not surprising that naive childhood dreams of saving the world, as well as of how it will be almost completely destroyed, resulted in a grandiose and, as it seemed to them, well-thought-out plan, imprinted in an inept sketch in a notebook. Well, the plan turned out to be really excellent. After all, if he were no good, a mysterious stranger, calling himself " Friend", could turn him into a terrible scenario in which the world is exactly like in a notebook - rush to end its existence?