Shugo Chara! Vol 2

From the Kodansha edition

FRIENDS IN NEED Cute schoolgirl Amu has a secret: She has three magical companions. Only these enchanted Guardians know who Amu’s true self is, and they’ll do anything to help her unlock her heart! They’re searching for a magic egg, a powerful weapon that could mean trouble in the wrong hands. To find this egg, Amu will have to change her life–and finally learn to be true to herself. This volume of Shugo Chara! includes special extras after the story!

Source: Anime News Network Encyclopedia