In this chapter, the author develops a computational model of the narrative ability for artificial agents. To illustrate an overview of this study, the author addresses an architectural and conceptual systematization of the narrative ability. The proposed model consists of two essential elements: the “mental world” as the internal representation of the world that is formed from many stories, and the mechanism of “narrating” as the act of expressing part of the mental world. In this chapter, the basic concepts and system frameworks of the narrative ability, mental world, and narrating are presented.