The secret behind why Prizmmy and Prism Mates disbanded

Memories

It was a chilly Saturday morning in Tokyo and the streets were blanketed with snow. Karin made her way towards the train station that would take her to the Avex building, where she and the other members were going to have a 3 hour long practice that Saturday morning.
"I'm gonna miss the train!", Karin cried as she ran towards the train bound for Harajuku. She jumped into the train just as the doors started closing. Karin gave out a sigh of relief and leaned into the cold metal wall of the train cabin. She then searched her bag for her baby pink ear buds and realised that she had, in her hurry, forgotten to bring it. Just as she was about to give out another sigh of stress, out of the corner of her eye, she spotted a gleam coming from the bottom of her bag. She dug into her bag and fished out that gleaming object. Her eyes widened in pleasant surprise when she realised that it was a pair of faint yellow ear buds which was a birthday gift from one of her fans. A smile stretched across her face as a thought occurred to her: It has been almost 6 full years since Prizmmy had debuted in 2010. She beamed, recalling all the fond memories she had made with fans and members alike. It had been a hard 6 years full of sweat and tears, but now that they had come so far, she had finally realized how this one group so special to her had made such a big impact on her life. Had it not been for everybody who had made Prizmmy possible, she would have probably been stuck with Roni Girls as a model for those 6 years, and laughed at the thought. She plugged in her earphones and pressed the 'shuffle' button on her music. Just then, the familiar happy tune which she had known for the past 6 years leaked out of her earphones. Everybody's gonna be happy was Prizmmy's debut song, and whenever she listened to it, her heart swelled with memories of her debut days which she spent with Mia, Reina and Ayami.
"Ayami... " Karin whispered. Ayami had been one of her best friends while she was still in Prizmmy. She still remembered when they went for their first abroad live...
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Flashback...
"Hey Karin, what is this food?"
"Eh? Ummmmmm... I think it's Prawn noodles?"
"Prawn noodles? That's something new! Although I never thought the people of Singapore would put prawns in their noodles though... 😁😁"
"That's exactly what I thought, Ayami!"

"Haha! Great minds think alike nee~"

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Sadly, after Ayami joined Asai Kikaku, her manager had prevented her from contacting the members of her old group, so she and Ayami had lost contact over the years.
"Ayami..." Karin said in a bare whisper as a tear slowly trickled down her cheek. Unknowingly, she started singing along to the Everybody's gonna be happy without knowing it.
"Everybody's Gonna Be Happy with Me
Hitori de nayamanaide
Don't worry! Kimi ga naita tte with You
Itsu demo soba ni iru...."
She sang quietly, choking back her tears in the process. She missed those days she spent with Ayami. But she knew that it would be close to impossible to meet her these days.
"Ayami.... I miss you..."