We developed a story creation platform that allows for collaborative content creation in a 3D environment by utilizing avatars, animations, objects, and backgrounds. Our story envisioning platform provides a shared virtual space that promotes collaborative interaction for story construction, involving a high degree of learner input and control. It allows the L2 learners to perform as actors and directors to create the story and supports offline or online collaboration (online chatting). Using state-of-the-art technologies, the system creates 3D stories from text to be presented in virtual reality. The learner can choose premade assets and input the story script for conversion into story elements and timelines. Experiments with 35 intermediate learners of English on the usability of the system and user engagement confirmed the system's effectiveness to promote learner collaboration, peer support, negotiation, opinion exchange, and critical thinking. Learners found the system to be a powerful tool to visualize their thoughts, and revise/expand their stories, according to questionnaire results. This system brings an interesting and intense language practice that encourages learners to actively participate in the learning process through collaboration. [For the complete proceedings, see ED600837.]