しゅごキャラ！　ジュエルジョーカー

Amu Hinamori has protected the eggs of children's hearts with the Guardians at Seiyo Academy Elementary. After she becomes a middle school student, her ordinary days seem ready to continue. She is suddenly transferred to Arcana Academy. Rumors there say that students' heart eggs are being marked with Xs one after another. Amu begins investigating the cause with Tadase while carrying a secret mission.