After a terrible betrayal, Lucy, Natsu, and Wendy are imprisoned beneath the palace. Meanwhile, Carla and Happy discover a world of cats just like them. There, they learn the truth about their duty, and their lives are revealed to be full of lies.

Happy and Carla manage to rescue Lucy from the Edolas version of Erza, only to be chased by an army of Exceeds. As the dragon slayers are drained of their power in the dungeons, the king activates Code ETD and starts an unexpected rebellion.