Yonosuke Hikura is a typical high-school freshman, except he had been charged with a spiritual mission. Demon Fighter, a role that has been handed down from generation to generation of the Hikura family, now rests on his shoulders.

To aid him in his charge to rid the stray demons from Heaven\'s World, he uses a precious spiritual sword, and the guidance of a tiny spirit from Earth\'s World, Tsukinozyo Inbe. However, Tsukinozyo\'s brother, Yukinozyo, seeks to steal his precious sword, planning to cause chaos in Heaven\'s World. Can Yonosuke keep all hell from breaking loose?