This paper presents a Web-based nature sound ensemble learning system that allows students to create a narrative-episode with "visual", "auditory", and "experimental" effects. Main component of our system is implemented in the Web environment and can be easily introduced to PCs in a classroom for nature sound ensemble lessons among remote learners, classes, and schools. In this study, we show the feasibility of our Web-based ensemble learning system, where several learners actually participate in the remote nature sound ensemble lessons using example "narrative-episode" with pictures and nature sounds.