Abstract--This paper proposes an agent system that semiautomatically creates stories about daily events detected by ubiquitous sensors. These stories are knowledge of inhabitants' daily lives and it may be useful for human-friendly agent. Story flows in daily lives are extracted from interaction between sensor room inhabitants and a symbiotic agent. The agent asks causal relationships among daily events for inhabitants to create the story flow. Experimental results show that created stories let created stories perceive agent's intelligence.