The Egg of Dreams, My Would-Be Self.
Hikaru tosses away the Embryo, saying he doesn't want it anymore, and a giant X Character reforms and unleashes a wave of sadness on everyone! Hikaru says that sadness is worthless and not necessary, and Amu (with the others' help) uses "Open Heart Full Volume" to purify the giant X character. But what about Hikaru's heart's egg? The final, lost page from the picture book will be revealed! Source: crunchyroll
Aired 26/09/2009EP 51 - The Egg of Dreams, My Would-Be Self.

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...