The integration of smartphones in the language learning environment is gaining research interest. However, using a smartphone to learn to speak spontaneously has received little attention. The emergence of smartphone technology and its video recording feature are recognised as suitable learning tools. This paper reports on a case study conducted with 67 English as Foreign Language undergraduate students at Tohoku University, Japan. Students were encouraged to use their smartphone video recording feature to produce one 30-second video per week over a 12-week period addressing a teacher-selected theme. The results indicate that students were able to produce video digital stories to express their opinion regarding the teacher-selected themes, in the target language. The implications for teaching and learning clearly indicate that smartphone-based video storytelling is a relevant task for language learners who will have to become conversant with this medium of learning.