在这部我是小甜甜 永远的再一次动画/喜剧/家庭片中,クリィミーマミがファイナルステージを最後に引退してから2ヶ月後、森沢優は普通の小学生として日常を過ごしていた。そんなある日、マミのカムバック騒動が起こる。マミの正体を知る優と俊夫は絶対にあり得ない話だと一笑するが、パルテノンプロ社長・立花慎悟が極秘裏に進めていた。
Mamoru finds a couple of kittens and Yuu adopts them. She names them NoraPoji and NoraNega as a souvenir of her two friends Poji and Nega. While she bathes them, she remembers the events leading to her final concert as Creamy Mami, two months ago. Shingo flies back from the USA with a little girl named Ai Hayakawa, the daughter of a diplomat. He plans to launch a secret "project M". A publicity campaign is launched to announce Creamy Mami's return. Supposedly, she was spending the summer in an American dance school and plans to come back. Nega and Poji come back from Feather Star to find out if Yuu is happy without them. Since they do not want their presence known, the enter the two kittens' bodies. Megumi, Kidokoro, Snake Joe, Toshio, Midori and Yuu all team up to find out about "Project M" and be invited to a very private Creamy Mami concert that Shingo organized. Yuu wonders if there really is another Creamy Mami, one that would have received the same magic powers she once did. ...
