守护甜心!

每个人的心里都蕴藏着一个理想中的自己，守护甜心以这样的想像为主轴，叙述每个孩子心中都隐藏着一颗称为心灵之蛋的神奇之蛋，里面孕育著理想中自己的可能性。

就读圣夜学园小学五年级的主角日奈森亚梦是别人眼中的酷女孩，大家总是以“Cool & Spicy（又酷又火辣）”来形容亚梦，但事实上亚梦只是个不擅长表达和内向的普通女孩，却受到外在形象的束缚无法表现出真正的自己。 就在亚梦的祈祷下，亚梦心中的心灵之蛋出现了。并且孕育出了亚梦理想中自己的缩影 ─ 守护甜心。 同时，圣夜学园里一群称为“守护者”的学生会是全校的偶像，但原来，这群风云人物其实是由一群拥有守护甜心的学生组成，他们虽然看起来完美无瑕，但其实也想要变成理想中的自己，想要改变自己。 在发现亚梦也拥有守护甜心之后，他们便开始邀请亚梦加入他们。原来，守护者们同时也在找寻一颗能实现任何愿望，名为胚胎的魔法蛋，但同时，一家名为复活社的集团也正在寻找胚胎，并且为了寻找胚胎，不惜运用腐化人的心灵之蛋的方法，让人失去勇气和信心，将人的心灵之蛋因为被主人自我放弃而成为“坏蛋”。 亚梦及守护者们努力对抗著复活社及帮助失去勇气的人重拾信心，并且寻找著胚胎，旅程中也渐渐找到了真实的自我……

聖夜学園でウワサのスパイシー小学生・日奈森あむ。口下手な性格が災いし、「クール」というキャラが学校で一人歩き…。ほんとうの自分とのギャップに悩む5年生の女の子。守護霊の存在を信じて、「生まれかわりたい」と祈った日、突然、3つのたまごがベッドの中に!たまごから生まれたのは、ラン・ミキ・スゥの3人の「しゅごキャラ」。この子たちは、「もう一人の自分」だっていうけど・・・。

Amu Hinamori is a student at Seiyo Elementary, where she has a reputation for being "cool and spicy"; however, her real personality is that of an extremely shy and easily intimidated girl. One night Amu makes a wish that she would have the courage to be reborn as her "would-be" self. The next morning Amu finds three brightly colored eggs—red, blue, and green—in her bed. Each egg eventually hatches into a Guardian Character: Ran, Miki, and Su. Guardian Characters are angel-like beings that aid a person into becoming their "would-be" selves and fulfill the person's dreams. The Guardian Characters accomplish this by giving encouragement and advice, but they can also temporarily change a person's personality and abilities. With the Guardian Characters, Amu's life becomes much more complex as she now struggles to deal with her new personalities and the Seiyo Elementary Guardians—a student council group where each member has their own Guardian Character—who recruits Amu to search for and seal the X eggs and X Characters, corrupted forms of people's dreams.