After their last battle, Asta and some of the others decide to chase after Captain Yami and some others who had already headed into the Shadow Palace. However, the elves get in their way. It was then that Captain Fuegoleon and Captain Mereoleona, both who had just awakened, showed off their true powers. Asta and the others are happy to have their help, but then notice that the door to the Shadow Palace closing. In order to get Asta and his group into the palace, the other Black Bulls hold off the elves outside.

Yuno manages to enter the Shadow Palace with his pendant and runs into Patry and the others. However, his pendant is immediately stolen. Now, all of the necessary magic stones have been collected and the elves' wish was supposed to come true. However, an uninvited guest appears before them: A devil from another world. They find out everything that happened between the elves and humans were actually a part of his plan all along. Yuno can't hide is astonishment at how powerful the devil is as he tries to fight it, and then Asta and Mimosa also arrive!