The secret behind why Prizmmy and Prism Mates disbanded

Coming together again

Everybody watched as Momona ran out of the room in tears.
"So? What are you guys waiting for? Go after her!" Mirei shouted. Karin shot a stern look at her sister.
"Mirei, let's leave her alone for a while. Let's give her some space."
Mirei felt the tears burning behind her eyes. Eventually, she sank to the floor and sobbed into her knees. It was hard for Karin to see her beloved sister like that and she went forward and put her hand around Mirei. The room was silent with the exception of Mirei's sobs. For the first time, everyone realised there really was nothing they could do...

That night, Reina tossed and turned in bed. She found it impossible to sleep. Eventually, she called the others, hoping someone would answer. Unsurprisingly, they all had the same problem as her.
"What are we going to do? Do you think we were a bit hard in Momona this morning?" Hina asked.
"I think we were. It's also not entirely her fault she's graduating." Karin said.
There was silence at the tone when Airi spoke up. "I'll go talk this out with Momona tomorrow. I should as a good friend of hers,"
"We're coming with you," Reina said, and nobody disagreed.

The next day, everyone searches all over Tokyo for places Momona might be. After 3 hours of agonizing searching they finally found her on the rooftop of Avex building crying in a corner. Sana went to her side and hugged her. Momona couldn't hold back her tears and sobbed into Sana's blouse, drenching it with her tears. The others tried their best to hold hands their tears but to no avail. They huddled together in big group hug.

"Hey, why don't we have a sleepover tonight?" Reina suggested between sobs. The others all looked at her as if she was crazy. "Why are you suggesting that now?!" Mirei asked.
"I just thought that since we don't have much time together, why don't we try it at least once? Right here, at Avex."
They all looked at each other, thinking that that was a pretty good idea.
"Then it's settled, we'll meet at the practice room tonight."