Shugo Chara Chan! Vol 4

From the Kodansha edition

THE GRAND FINALE IS HERE! Guardian characters are the "you" that you truly want to be, born from the Heart's Egg of children. Ran, Miki, and Su are the Guardian Characters of Amu, a cool and spicy girl in grade school. There's always something fun going on every day with these tiny, upbeat girls. Come take a look! FINAL VOLUME!

Source: Anime News Network Encyclopedia