Actually, the moment Kagura Hikaru saw Ruzaki Mami's parents in the living room, he realized something was amiss.
They were sitting side by side on the couch as if they were waiting for someone.
However, Kagura Hikaru and the others had not been informed in advance, only Ruzaki Mami knew they were coming. Why then did Ruzaki's parents look as if they had been waiting for a long time?
After seeing the attitude of Ruzaki's mother, Kagura Hikaru finally figured it out.
It seemed that this young girl, Ruzaki Mami, had somehow given herself away, discovered by her parents.
Only her teammates knew about her involvement in the band, and they had no reason to betray her. It must have been someone who knew Ruzaki Mami and happened to see her without makeup, her parents had hired a private detective to follow her, or it was simply a coincidence.
Regardless, Ruzaki Mami was exposed, and so were they, who had come to negotiate on her behalf.
But Kagura Hikaru was not really panicked.