Nightmare is a kind of existence that is close to the origin of life. It has enhanced power but does not have a high IQ. It lives in a country called [Nightmare Realm] following the biological laws, but a small part of them will appear in our world.
Because they have a different way of survival from us, they sometimes threaten human survival, so there are [Nightmare Masters]. The nightmare master uses the power of nightmare to ensure that the two worlds operate normally according to their own trajectories without interfering with each other.
A familiar yet unfamiliar world unfolds before our eyes. The hidden volume slowly unfolds, and are you ready to delve deeper into it?