Shugo Chara! Vol 7

From the Kodansha edition

BLACK CAT All the time they’ve been battling the Easter Corporation, Amu and her friends have never known which side mysterious bad boy Ikuto has been on. In this volume of Shugo Chara!, Ikuto is in trouble and has only one place to hide: Amu’s house! Will Amu finally learn Ikuto’s secret? This volume of Shugo Chara! includes special extras after the story!

Source: Anime News Network Encyclopedia