We developed a system that generates stories from hypothetical questions. Specifically, the stories are expressed in a knowledge base of the form “If Then.” The system allows users to create a story that has a synopsis different from the original story by changing the “If.” For example, if the user changes the appearance and personality of a character, the outline of the story also changes. We think that this process can help increase the creativity of the users of the system. This system was developed to help users visualize written stories as images and allows users to experience stories interactively. Evaluation experiments conducted on 21 children of elementary school fifth grade children showed that there was improvement in the children’s creative ability, demonstrating that the system is effective. Thus the system can be used as an idea creation tool for narrative generation as the process helps to increase the creativity of users.