The Leywin family travels to the floating city of Xyrus so that Arthur can begin his formal education in magic. The adventuring party that Reynolds and Alice belong to, the Twin Horns, accompany them as guards, when they run into something unexpected...

Having arrived in the city of Xyrus, Arthur is thrilled to meet his younger sister, Eleanor, and to reunite with his parents. While sparring with Reynolds, he demonstrates how much he has grown. After witnessing Arthur's strength, Vincent Helstea proposes that the reborn king enroll in Xyrus Academy, a prestigious sorcery school.

The Helstea Auction, which even the royals of the Sapin Kingdom attend, is opened. Vincent invites Arthur to the auction house. While among valuables on offer, Arthur discovers Sylvie has gone missing, and that she’s attracted the attention of a court sorcerer in the service of the Sapin Royal family!

Having arrived at Xyrus Academy, Arthur displays his skills to the school’s director, Cynthia, who proves to be every bit as formidable as her position as the head of the prestigious magic academy suggests. Despite being overwhelmed, Arthur still shows his power and the two strike a deal...