A transmedia writing project was implemented in a French composition course to develop, in a university context, scriptural and multimodal skills in Taiwanese students. The digital comic 2 (Molina Fernández, 2020) is presented and is the subject of a transfiction exercise into a multimodal story on the Book Creator application. As a result of the project, 20 digital albums were analyzed to study the traces of transfictionality as well as the different text-image relationships. The results indicate that the source story inspires the students’ rewritings by giving them narrative keys encouraging the development of a singular writing, just as the students’ stories enrich the source story by filling in its narrative ellipses. In view of a coherence of multimedia resources, transmedia writing also engages students to reflect on the properties of the medium and to create their own aesthetic style, thus deserving a better place in the language class.