This article contains details about plotlines described in the anime.
Do not proceed unless you want to be spoiled.
Cocoro Yazawa is one of Nico Yazawa's siblings.
Cocoro has an apparently calm personality among the Yazawa siblings besides Cotarou, shown on how she reacted when she first met the other members of μ's.
|04|| "No. 1 Idol in the Universe"|
(宇宙No.1アイドル "Uchuu Nanbā 1 Aidoru")
|In Episode 4, while the other members of μ's were looking for Nico, Hanayo Koizumi saw a little girl who looks a lot like Nico. They then learned that she was Nico's little sister, Cocoro. While Cocoro was leading them to their home, they learned that Nico told her siblings that she was the center of µ's and the others were her backup dancers.
On the way home, Nozomi Tojo tells the others that Nico was telling her siblings all that even after she failed to become a super idol in her first year because she didn't want their vision of her to be destroyed. After hearing this, the girls arrange for Nico to give a special performance for her siblings, claiming it to be her last performance as a 'solo idol' before joining her fellow idols as equals in μ's.
|09|| "Melody of the Heart"|
(心のメロディ "Kokoro no Merodi")
|In Episode 9, the day of the final preliminaries arrives. At Nico's house, Cocoro and Cocoa practiced doing Nico's signature move, "Nico Nico Nii". Nico felt happy and told her two sisters that they'll definitely pass the preliminaries. Nico told her siblings that she'll sing her heart out as center, after all, everyone in µ's is the center.|
|13|| "Come True! Everyone's Dream"|
(叶え！みんなの夢―― "Kanae! Minna no Yume")
|In Episode 13, Cocoro, along with her mother and siblings, met Honoka Kosaka, Rin Hoshizora, Maki Nishikino, and Hanayo at the school gates and attended Nico's graduation ceremony.|