Amu Hinamori and her fellow Seiyo Elementary Guardians persist in their mission to locate and cleanse X Eggs in their pursuit of the enigmatic Embryo, a legendary egg capable of granting any desire. Their endeavor is complicated as they race against the sinister Easter Corporation to secure the Embryo first. To draw out the coveted egg, Easter enlists the help of the detached Lulu de Morcerf, whose unique power, bestowed by a ruby necklace, transforms Heart Eggs into enigmatic Mystery Eggs resistant to purification. These mysterious eggs lead to involuntary Character Transformations, posing a significant challenge to the Guardians. With the mounting threat posed by the Mystery Eggs, the Guardians must swiftly identify and eliminate their source to prevent a crisis. Balancing the pressure of these dual tasks, can the Guardians retrieve the Embryo and tackle the menace of the perplexing Mystery Eggs before it spirals out of control?