YazOku is a large library application with co-written stories with the contributions of members. The stories in the app have the format of “choose your own adventure” and the reader creates his own story entirely by his own choice. When the reader arrives on the last page that has been written, he can personally write the next page of the story or, among all potential pages written for that content, he can vote for the one he likes most. An app that appeals to everyone who loves to read and write books and that everyone will enjoy.