Watch Online Free HD Solarmovies. The official stage play adaptation of Koyoharu Gotoge's series Kimetsu no Yaiba. The time is Taisho, Japan. One day, Tanjiro, a kind-hearted boy who sells charcoal, has his entire family killed by a demon. Furthermore, his only surviving sister, Nezuko, has been transformed into a demon. Tanjiro is devastated by the hopeless reality, but decides to pursue the path of "demon hunting" in order to return his sister to a human and avenge the demon that killed his family. The sad story of brother and sister, woven together by humans and demons, begins now!