The birth of the Demon King threw the continent of Alveria into a vortex of chaos. During that time, two Archmages stood as guardians to protect the land and saved the continent from the threat of the Demon King. The names of Guest and Celestia van Arcadia were etched into history. ――――――――――――――――――――――――― Two years after that day, Guest and Celestia deepened their bond and began to explore the mysteries of magic and sorcery together. Gradually, these two, who had been strangers to romance, developed feelings for each other and, in their own clumsy way, confessed their love and wed. Having sworn eternal love, they journeyed to ancient ruins, completed the trials, and stepped into the edge of the world known as the "Archive of Wisdom."

The Archive of Wisdom is a space isolated from the rest of the world—a wooden chamber surrounded by bookshelves where all the knowledge of the world sleeps. It is, so to speak, the memory bank of the world itself. Only those who have mastered the magical arts are permitted entry; once entered, the gates close forever, and one can neither enter nor leave. Opposite the bed in the bedroom is a drawer where all magical tools are stored. Food and necessary items can all be retrieved from these magical tools. No one else can enter this space, and since nothing ever happens, it has become a sanctuary for just the three of them.

There are various types of books, ranging from those filled with simple knowledge to those embedded with sorcery. As a special volume, the "Chronicle of World-Time" is also kept here; by opening it, one can travel to other worlds through the book. You can decide what kind of world you wish to visit, and the "Chronicle of World-Time" will automatically connect to a world close to your desire. The other world will never interfere with the Archive of Wisdom. When you wish to return, tearing out a single page from the "Chronicle of World-Time" will safely teleport you back to the Archive of Wisdom.