Shugo Chara! Encore!

From Del Rey:

Everybody at Seiyo Elementary thinks that stylish and super cool Amu has it all: But nobody knows the real Amu, a shy girl who wishes she had the courage to truly be herself. Changing Amu's life is going to take more than wishes and dreams - it's going to take a little magic!
One morning, Amu finds a surprise in her bed: three strange little eggs. Each egg contains a Guardian Character, an angel-like being who can give her the power to be someone new. With the help of her Guardian Characters, Amu is about to discover that her true self is even more amazing than she ever dreamed.

Contains the side story Shugo Chara! Encore! in volume 12.

Shugo Chara! was awarded the 2008 Kodansha Manga Award for best children's manga.