Natus and Lucy's expedition team discovers a strange gateway in the middle of the desert that leads to a dangerous underground dungeon. Elsewhere, Gray's team discovers a puzzle-filled cave--and Sugar Boy.

The Butt Jiggle Gang is back and they're dead-set on finding one of the mysterious clock parts before Fairy Tail does. In order to get ahead of them, Erza dons one of their skintight black uniforms and teaches them the meaning of true villainy.