Tadase and Ikuto! The Horoscope of Destiny!
When Tadase was little, there was a time when Ikuto and Utau lived together due to certain circumstances. The three of them used to play all the time but when Ikuto took the Dumpty key, he disappeared. The old Ikuto talked to Tadase. Thinking of this Ikuto, Amu and the Guardians go to find him! Source: crunchyroll
Aired 22/08/2009EP 46 - Tadase and Ikuto! The Horoscope of Destiny!

2008
Shugo Chara!! Doki
With things having quieted down a bit for the Guardians, they can now focus on things besides fending off the peril of the evil Easter Corporation. Amu is having some troubles deciding which guy she likes the most, and hiding Ikuto in her room. Not only does the Embryo still elude the Guardians, and worries of Easter being suspiciously inactive, the threat of a new X Egg appears...