Negima! Omnibus 6: Magister Negi Magi

'Negi finds himself imprisoned in a secret underground dungeon beneath a Tokyo church, just as genius time traveler Chao Lin puts into motion her plan to reveal magic to the world! His faithful students will have to find a way to bust him out, or he's doomed to spend the rest of his life languishing as an ermine!' -- p. [4] of cover.