From the back of the book:
When the red room rises, the fight begins.
When a moon shining crinsom rises into the sky, the world distorts, the truth becomes exposed. Emulators - Invaders coming from outside the world. The only ones who can defeat those strong enemies, are the "magicians of the dark of night" - the Night Wizards.
New enemies, new wizards.
New emulators called "dark demons" have appeared. Because of the appearance of these strong enemies, who surpass "invading demons", the emulators thus far, the world is facing new danger. And as if responding to this danger, among the wizards as well, persons appeared awakening to new power. Borrowing the strength of the demon lords, the kings of the invading demons who should be their enemies, the night wizards carry on fighting.
The present day magical fantasy TRPG "Night Wizard" presented by Takeshi Kikuchi becomes The 2nd Edition and makes a grand appearance!!
Night Wizard! The 2nd Edition
The world is being targetted