こころ の たまご
The Heart's Egg, also known as a Guardian Egg, is an artifact that exists within everyone's heart but remains invisible from the naked eye. It contains a tiny fairy that is called a [[Guardian Chara]]. It is preserved by the owner's confidence and hopes of fulfilling his or her dreams.

As the child becomes an adult, the egg will disappear without a trace. However, it can be assumed that if the child stays attached to his or her hopes and dreams, the egg will stay even through adulthood.

It represents an actual [[egg]] in shape. However, each egg has a different design based on the owner's desires and personality.
heart's egg (shugo chara!)