10岁的女孩森泽优一次机缘巧合下得到神秘力量．可以变身成为一位漂亮且拥有动听歌喉的16岁美少女CREAMY MAMI。在一次电视台的户外节目中首次演唱而一鸣惊人。于是小优以家里所卖的奶油薄饼为名，开始了偶像CREAMY MAMI的银色传说。《我是小甜甜》里面有一个很有趣的处境，就是外表十六岁的CREAMY MAMI，其实骨子里只是一个十岁的女孩小优，所以思想上及动态上都很有趣。正因为这样，人物的可塑性就随著变高了，剧情亦因而能够变得丰富起来。小优青梅竹马的男朋友大友俊夫，也是小优暗恋的对像。小优作梦也想嫁给他，而优一直喜欢着的这个儿时的好友俊夫，却在一无所知的情况下竟对CREAMY MAMI一见钟情……并成为CREAMY MAMI的死忠歌迷，心里只有CREAMY MAMI一人。而优是CREAMY MAMI的秘密却不能够让别人知道，因为只要有人看到，优的魔法就失灵了，将不能够再次变成CREAMY MAMI，优为此非常的苦恼，于是一段特殊的三角恋情就展开了，许多有趣的故事就发生了…在歌谣节的前夕，优和俊夫因为歌谣节CREAMY MAMI参加的歌唱比赛闹了很大的矛盾，因为俊夫的眼中只能...
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