Every child has an egg in their heart, unseen at first, an egg
with the would-be self of their dreams. Hinamori Amu, part of a group
called the Guardians, protect those eggs from becoming x-eggs, eggs
filled with resentment and resignation that gives children troubles.
Amu's job is to capture and restore x-eggs to their orginal form. She
does this with the help of her three Shugo Chara (guardian characters
or her would be selves), Ran, Miki and Su. Thanks to them she can
change her character and abilities, and so fight against the mysterious
organization Easter which aim is to find a special egg called Embryo
using the x-eggs.