There are many desires in this world. One of the strongest desires is sexual desire.

Unresolved sexual desires of non-popular men remain as delusions. This delusion haunts those who have the same strong sexual desire but have no way to release it, It further amplifies the desire that the person originally has.

Those with strong reason and mental training can overcome it, Those who let their desires run wild often end up committing sexual crimes.

For the solution, A wandering delusion of libido possessed by an unpopular man is called an evil spirit, had to be taken away. Those who have the technology to purify by special prayers and draw out evil spirits, are called Nuki Miko.