Soulstarvation is the state a Ghost, Yokai, or Demon will enter during a long period of not consuming any souls. It is the apparitional version of hunger induced madness.

As most know, all apparitions require souls to stay physically manifested in the prime material plane. Consumption of souls causes disturbance in the electromagnetic field and may even attract other apparitions. However, when a ghost does not feed on any souls within a duration of one week to four years, they will become Soulstarved. Upon which, they will attack everything in sight to feed, and lack any of the calculated intelligence they may have had. Nekomata are most effected by Soulstarvation, as they are benevolent and refuse to consume the souls of sapient innocents.