At the Gravekeeper's Palace, Negi and his companions are ready to mount a rescue and save the world, but Fate's evil organization is about to teach them the meaning of Cosmo Entelekheia and present them with a temptation that may make them forget their goals.
Negi and friends accept an invitation to a ball where Goedel claims he will tell Negi what he wants to know, but, knowing it is probably a trap, Haruna urges Negi to make as many pactios as he can--if he can get the girls to cooperate, that is.
Negi wants to find his missing students and bring them home, but he is tempted by a sinister man who promises to give Negi answers if he agrees to join his cause.
"With the plot of the insidious Cosmo Entelekheia revealed, Fate has forced Negi to choose between the safety of his friends and the destiny of the Magic World. Everyone is going to have to draw on all their strength to get out of this one, but will it be enough? Inspired by the story of his father's conquests during the war, Negi can not fail!"--Back cover.
The battle with Fate continues and Negi is more determined than ever to win him over to his side, but with the powerful magic they are both using, only one of them may survive.
Before Negi can protect his students from Fate, he must fight back the darkness in himself, which is in danger of consuming him and placing his students in danger from the monster he will become.
When Cosmo Entelekheia attacks, killing people left and right in the Magical World, Negi and his friends are devastated, but they are even more astounded when Nadaoka strikes back, revealing all the secrets of the Magical World as a result.
After revealing information about Negi's parents and his village, Goedel invites Negi to join him and promises him vengeance for the destruction of his life. Although Negi denies wanting revenge, he finds that a part of him does.
