The '''primal hiohijo''', also known as '''primal spirits''', or simply as '''hijo''', are [[Splinter]]s of [[Virtuosity]] found on [[Komashi]].{{book ref|yumi|17}} They naturally reside underground, and are attracted by thoughts, emotions, and artistic expressions.{{book ref|yumi|17}} They can be bound by a [[yoki-hijo]] into useful tools and devices,{{book ref|yumi|4}} or be utilized to produce and supply [[hion]].{{book ref|yumi|part=anotherepilogue}}