During one afternoon, Juvia met Mirajane while Erza and Lucy went away for some moment, where she invited Juvia to come to her place to help her do something. As Erza and Lucy finally came back, they asked Mirajane if they can come along to her place, and she accepted it. Turns out Mirajane wanted the help from Erza, Lucy, and Juvia to 'demonstrate' her magical power, by turning all three of them into her personal mummies - which not just for decorations, but also her personal playthings.