Once upon a time, there was a box containing all the evils in the world. It was opened by a woman named Pandora and the land was plunged in darkness. In a time of castles and kings, demons terrorize the land, enslaving humanity before the might of the demon army. The lands cry out for a hero, and that cry is answered by Hamel, a mysterious cloaked stranger who commands massive power while wielding his Big Freaking... Violin. Over ten years later in 2008, much to the surprise of fans, Watanabe published a Gaiden chapter leading up to a sequel manga entitled Violinist of Hameln: Schelkunchik.