A software application and method enables a personal narrative agent (PNA) to create and manage multiple dynamic customized story experiences for a subject user in a user-observable environment having one or more objects with which the subject user may interact. The PNA selectively interacts with one or more of those objects to manipulate the environment in furtherance of the story experiences. The PNA further maintains data relating to the subject user, the environment and the multiple story experiences of the subject user. The PNA also simultaneously manages each of the story experiences which each reach its own narrative conclusion consistent with input and characteristics of the subject user and any objects selected to influence the story experiences. A unique PNA may be assigned to each of multiple users which independently manage different story opportunities for their respective users, such as to enable each of the multiple users to pursue individual stories independent from the stories of the other user. A PNA of one user may interact with a PNA of another user to negotiate a story opportunity involving the second user for the first user, and vice-versa.