Fairy Tail 34

Outraged by the way Yukino has been treated, Natsu goes on the warpath and challenges the master of Saber Tooth to a fight! Back at the tournament, the wizards prepare to face Pandemonium, a castle built out of magic containing one hundred terrible monsters, the most powerful of which are easily capable of taking down a Wizard Saint. But when Erza, desperate to reclaim Fairy Tail's honor, wins the right to go first, she declares that she'll take on all one hundred at once!

Volume 34 of the FAIRY TAIL manga series by Hiro Mashima.