Based on the best-selling book by Naoki Higashida, this touching documentary is an immersive cinematic exploration of neurodiversity through the experiences of non-speaking autistic people from around the world. The film blends Higashida`s revelatory insights into autism, written when he was just 13, with intimate portraits of five remarkable young people. It opens a window for audiences into an intense and overwhelming, but often joyful, sensory universe. Narrated passages from the book reflect on what his autism means to him and others, how his perception of the world differs, and why he acts in the way he does: the reason he jumps. The film distils these elements into a rich tapestry that leads us to the film`s core message: not being able to speak does not mean there is nothing to say.