On that long summer day in 1969, Kenji, who was still a primary school student, built a secret base with his friends.They fantasize that they are on the mission of fighting against the evil forces who are trying to conquer the world, and record these imagined battles one by one in a notebook called "The Book of Prophecy".At that time, their eyes were shining with the light of innocence and dreams. Time flies, and 1997 is coming in the blink of an eye.Kenji, a boy who had a dream of a hero back then, is now just an ordinary store manager in a convenience store, living an ordinary and boring life - he once dreamed of becoming a rock star, but reality has long buried that passion.However, a sudden change broke his unchanging days: his childhood classmates died mysteriously, and a complete family in the community disappeared mysteriously. At the same time, a mysterious religious organization quietly emerged, and its leader called himself a "friend". A series of strange events followed one after another, which was surprisingly consistent with every plot written in the "Prophecy" of childhood.The gears of destiny are slowly turning, as if the fantasies of childhood are moving towards reality step by step. Is this the beginning of the end of the world? Who is the mysterious person who calls himself a "friend"? And Kenji, is he destined to stand up again and face the forgotten prophecy for many years?