Shugo Chara! Jewel Joker

After graduating from Seiya Elementary School, Amu is ready to start junior high school. Amu is glad to be with her dear friends, but then she is asked to undertake a "secret mission" and has to transfer to a new school...? A new adventure of Amu and the Shugo Chara is about to begin!

(Source: Kodansha, translated)