Fairy Tail Volume 11 by Hiro Mashima
The Tower of Heaven story arc continues as the Fairy Tail team arrives at the tower to take out the crazy evil Jellal. Unfortunately, Jellal has brought in a trio of magicians from a guild specializing in assassination. Maybe Natzu could take them out if he hadn't got a gigantic cat's head mask stuck on his head! Meanwhile, the Magic Council is discussing whether to use a weapon of mass destruction to take out the tower before Jellal has a chance to revive Zeref, an extremely evil wizard whose return is sure to be a world-wide catastrophe. Erza's backstory continues as we see her coming to Fairy Tail for the first time.
The action is exciting and the new villains are entertaining and a legitimate threat. The stakes are suitably ramped up and the story is interesting. I'm looking forward to watching the anime episodes (season one, episodes 36-38?) for this volume. It's fun to read before seeing.