Beachside Miracle Duet
A joint concert for Mami and Megumi has been planned for Isohama Beach. Yuu is worried about having to stay there for two nights, but after throwing a tantrum she convinces her parents to go. The night of the concert, Megumi plays a trick on Mami by suggesting a duet with an audience member: Yuu! Yuu is shocked, but manages to pull it off with a few tricks.
Aired 19/08/1983EP 8 - Beachside Miracle Duet

Magical Angel Creamy Mami
Creamy Mami is about a young girl, Yuu, who after seeing a spaceship is given the power to use magic for one year. She is also given 2 cats, Poji and Nega, to watch over and guide her. Using her magic powers to transform into the idol Creamy Mami, Yuu must work hard at acting, singing, helping her parents at their crepe shop, fighting aliens and bad guys, going to school, plus try to get the affections of her childhood friend Toshio.
(Source: AnimeNewsNetwork)