Negima!: Magister Negi Magi, Volume 28

Now that the tournament is over, Negi wants to find his missing students and take them home. But first, he's confronted by a sinister man who claims to know the answers to all of Negi's questions. He promises to share those answers--but only if Negi will join his cause.
Available on DVD from FUNimation Entertainment
Includes special extras after the story!