From the back of the book:
The night before the Jewel War -
The world changes greatly -
During this single night
"Overnight" is a campaign scenario collection for "Night Wizard!". The 5 scenarios recorded are depicting the struggle surrounding the "Jewel of Temperance" which will continue in new developments hereafter. The secret of the world is brought to light, and the current state that has held until now changes in a single night. With this campaign, you will stand at this turning point.
And thus record of the history thus far as tales become legends
"Night Wizard!" has presented many tales in its replays and supplements. We go over the history thus far and explain it together.
In addition, as a bonus, the "Hiiragi Renji Saga" is recorded, which puts the spotlight on Hiiragi Renji, who had become without anyone noticing a central character. We hope you will do us the favour of checking with your own eyes, how he built numerous legends as well.